Skin-peeling speed doomed hypersonic glider, U.S. says
April 23rd, 2012
12:06 AM ET

Skin-peeling speed doomed hypersonic glider, U.S. says

By Larry Shaughnessy

A test flight of an aircraft designed to whip around the world at Mach 20 failed when the high speeds peeled the skin off the unmanned plane, Pentagon researchers conclude in a long-awaited report.

For nine minutes in August, the Defense Advanced Research Projects Agency flew its Hypersonic Technology Vehicle at speeds reaching 20 times the speed of sound - fast enough to fly from New York to Los Angeles in less than 12 minutes. But then, something went wrong, and DARPA is finally explaining what happened.

"The most probable cause of the HTV-2 Flight 2 premature flight termination was unexpected aeroshell degradation," the research group explained in a new statement on the test flight.

Translation: The unmanned glider was streaking through the atmosphere when its outer skin started to rip off the airframe.

DARPA knew friction from the glider passing through the air so fast would cause it to heat up. It also expected "a gradual wearing away of the vehicle's skin as it reached stress tolerance limits," based on ground tests.

"However, larger-than-anticipated portions of the vehicle's skin peeled from the aerostructure," the statement said. "The resulting gaps created strong, impulsive shock waves around the vehicle as it traveled nearly 13,000 miles per hour, causing the vehicle to roll abruptly."

When that "anomaly" occurred, a safety computer slowed the glider down and it splashed down in the Pacific Ocean, where it's now probably an artificial reef with a moon roof.

The goal of the project is to create an aircraft that can fly anywhere in the world in under an hour to strike a target. The test plane was launched by a Minotaur IV rocket from Vandenberg Air Force Base in California, then separated from the booster and re-entered the atmosphere over the Pacific.

At Mach 20, friction from the surrounding air subjects the vehicle to temperatures of more than 3,500 degrees Fahrenheit (1,925 C).

DARPA said a group of independent experts decided they couldn't have predicted the problem. "The data from second flight revealed that extrapolating from known flight regimes and relying solely on advanced thermal modeling and ground testing could not successfully predict the harsh realities of Mach 20 atmospheric flight," the agency said.

A 2010 test also ended with the craft plunging into the Pacific. In spite of the problems, DARPA said it did learn a lot from the August test.

"We successfully incorporated aerodynamic knowledge gained from the first flight into the second flight," Maj. Chris Schultz, the program manager, said. And future flights will incorporate what was learned in the second test, he said.

Post by:
Filed under: DARPA
soundoff (1,778 Responses)
  1. Nncsfiple

    viagra online store review viagra online 500mg viagra online

    February 10, 2021 at 6:13 pm | Reply
  2. Ahkdreext

    canadian pharmacy online viagra online order medicine canadian pharmacies that ship to us

    February 9, 2021 at 3:16 pm | Reply
  3. Newport House Clearance

    I've been absent for a while, but now I remember why I used to love this website. Thanks, I?¦ll try and check back more often. How frequently you update your site?

    February 9, 2021 at 7:22 am | Reply
  4. Europa-Road Kft.

    I’m impressed, I have to say. Actually not often do I encounter a blog that’s both educative and entertaining, and let me tell you, you have got hit the nail on the head. Your thought is excellent; the problem is one thing that not enough individuals are talking intelligently about. I am very completely happy that I stumbled across this in my search for one thing relating to this.

    February 9, 2021 at 3:37 am | Reply
  5. Lbsxreext

    shoppers drug mart canada viagra gold Cialis Oral Jelly (Orange)

    February 7, 2021 at 7:30 pm | Reply
  6. Free Samples

    Wow that was unusual. I just wrote an extremely long comment but after I clicked submit my comment didn't appear. Grrrr... well I'm not writing all that over again. Regardless, just wanted to say fantastic blog!

    February 7, 2021 at 2:42 pm | Reply
  7. KbcxVelm

    trust pharmacy canada erectile dysfunction Viagra

    February 6, 2021 at 5:18 pm | Reply
  8. Keith Padel

    Earn $1000 a Day With Our Passive Income System

    February 6, 2021 at 10:48 am | Reply
  9. Laurice Lown

    Earn 10000 a Month With Our Passive Income System – Best Autopilot income system 2021

    February 6, 2021 at 10:12 am | Reply
  10. Fvfcfiple

    where to get free viagra where to buy viagra in toronto cheap viagra

    February 6, 2021 at 5:49 am | Reply
  11. Jbbvreext

    highest rated canadian pharmacies online canadian discount pharmacy list of legitimate canadian pharmacies

    February 5, 2021 at 11:21 pm | Reply
  12. Fqhhreext

    canadian pharma companies tadalafil buy medication without an rx

    February 5, 2021 at 9:39 pm | Reply
  13. Breann Cotheran

    Earn 500 a Day With Our Passive Income System

    February 5, 2021 at 7:55 pm | Reply
  14. Jbnbclups

    Cialis Soft Tabs anti-depressants pharmacy canada

    February 4, 2021 at 2:04 pm | Reply
  15. Fmnfreext

    cialis no prescription overnight shipping cialis w/o perscription cialis 100mg from china – cialis au ’

    February 2, 2021 at 5:46 am | Reply
  16. Make-money-in auto-pilot-2021

    Earn 500 a Day With Our Passive Income System Doing These 3 Steps – Step 1: Get our ready made niche websites, Step 2: Setup your Paypal account. Step 3: Run our Unlimited Traffic System from our Free 850 sources of traffic (Approximately 35000 views a day guaranteed). Then in few hours you will start receiving payments without do nothing! More info:

    February 1, 2021 at 2:37 pm | Reply
  17. Davis Canarte

    This is a very interesting article. Please, share more like this!

    February 1, 2021 at 4:59 am | Reply
  18. Make-money-in auto-pilot-2021

    Get Our Passive Income System – Step 1: Get our ready made niche websites, Step 2: Setup your Paypal account. Step 3: Run our Unlimited Traffic System from 850 sources of traffic (Approximately 35000 views a day guaranteed). Then just wait and earn your income 100 on autopilot. More info:

    January 30, 2021 at 9:08 pm | Reply
  19. Fhnhfiple

    Fertomid Asendin Diamox – canadian pharmacy online viagra ’

    January 29, 2021 at 9:19 pm | Reply
  20. KbbgVelm

    buy viagra from canadian pharmacy online order medicine viagra usa – Zenegra ’

    January 29, 2021 at 8:53 am | Reply
  21. Ngscfiple

    buy sildenafil generic online viagra no prescription canada buying viagra in canada – sildenafil citrate generic viagra ’

    January 29, 2021 at 8:19 am | Reply
  22. Jnscclups

    over night viagra discount super active viagra viagra soft tabs canadian pharmacy – viagra forsale ’

    January 29, 2021 at 3:02 am | Reply
  23. Merna Halaas

    I¡¦ve been exploring for a little for any high quality articles or blog posts on this sort of area . Exploring in Yahoo I ultimately stumbled upon this website. Studying this info So i am happy to express that I have a very good uncanny feeling I came upon exactly what I needed. I such a lot surely will make sure to don¡¦t disregard this web site and provides it a look regularly.

    January 28, 2021 at 10:01 pm | Reply
  24. Ahmdreext

    what is in cialis ingredients canada drugs online pharmacy cialis without rx – cheap prescription drugs online ’

    January 28, 2021 at 1:54 pm | Reply
  25. Florrie Giordano

    Best Marketing Services – Cheapest on Market. SMM Supreme is the Top 5 Best Social Media Website in the World. Best Quality-Price Ratio on the market with 714,928 orders until now. – Facebook Fan Page Likes for $4.50/1000 – Instagram Followers for $0.78/1000 – Youtube Views: $1.62/1000 – Twitter followers: $2.10/1000 – Paypal Deposit – Bitcoin Deposit – Fast order processing – 1 Hour Delivery (Click on the link in the profile for more details)

    January 28, 2021 at 12:52 am | Reply
  26. Tawanda Lopaz

    Do you want get more social network traffic, likes, subscribers? Our Company provide SMM Services that means (Social Media Marketing) that is directly using social network websites such as Twitter, Facebook, and LinkedIn to promote a website. High Quality Services / Our prices are the cheapest in the market, starting at $0.01 / 24/7 Support / API Support for panel leaders / Best prices

    January 27, 2021 at 11:26 pm | Reply
  27. Fmfvreext

    viagra levitra cialis which works better? 30 day free trial cialis viagra cialis levitra – generic cialis 40 mg ’

    January 27, 2021 at 10:33 pm | Reply
  28. Del Pio

    Best Marketing Services – Cheapest on Market. SMM Supreme is the Top 5 Best Social Media Website in the World. Best Quality-Price Ratio on the market with 714,928 orders until now. – Facebook Fan Page Likes for $4.50/1000 – Instagram Followers for $0.78/1000 – Youtube Views: $1.62/1000 – Twitter followers: $2.10/1000 – Paypal Deposit – Bitcoin Deposit – Fast order processing – 1 Hour Delivery (Click on the link in the profile for more details)

    January 27, 2021 at 2:18 am | Reply
  29. Fbgfiple

    viagra next day us delivery viagra without prescription viagra suppliers canada – cheapest soft viagra ’

    January 24, 2021 at 3:14 pm | Reply
  30. KbbtVelm

    how much does cialis cost best online pharmacies canada online cialis canada – online pharmacy without a prescription ’

    January 24, 2021 at 2:43 am | Reply
  31. Nmilfiple

    buy viagra with paypal viagra george south africa buy viagra brisbane – viagra, depoxtine ’

    January 24, 2021 at 2:25 am | Reply
  32. Jnhclups

    cialis 36 canada cialis and dapoxetine canada viagra/cialis black and gold 800 – cialis overnight shipping canada ’

    January 23, 2021 at 9:06 pm | Reply
  33. Ahmdreext

    how much does cialis cost at walmart online generic cialis best price cialis 20mg – cialis black ’

    January 23, 2021 at 7:37 am | Reply
  34. Irving Hauff

    Do you want get more social network traffic, likes, and retweets? SMM Supreme uses his own panel system to generate social media traffic to any website. Best Quality-Price Ratio on the market with 714928 orders until now. – Facebook Fan Page Likes: $4.50/1000 – Instagram Followers: $0.78/1000 – Youtube Views: $1.62/1000 – Twitter followers: $2.10/1000 – Paypal Deposit – Payeer Deposit – Automatic order processing – 30 minutes to send to customers

    January 22, 2021 at 9:28 pm | Reply
  35. Hairstyles

    I have observed that over the course of constructing a relationship with real estate managers, you'll be able to come to understand that, in every single real estate purchase, a fee is paid. In the long run, FSBO sellers really don't "save" the fee. Rather, they try to win the commission by simply doing an agent's work. In doing so, they shell out their money as well as time to perform, as best they might, the jobs of an realtor. Those responsibilities include revealing the home via marketing, offering the home to all buyers, developing a sense of buyer emergency in order to prompt an offer, organizing home inspections, dealing with qualification inspections with the mortgage lender, supervising fixes, and facilitating the closing.

    January 22, 2021 at 12:47 am | Reply
  36. Jbdcreext

    overnight delivery on viagra yahoo answers viagra purchase viagra online – order viagra online australia ’

    January 21, 2021 at 10:17 am | Reply
  37. useful site electric company near me

    This is really interesting, You are an excessively professional blogger. I've joined your feed and look ahead to in the hunt for extra of your fantastic post. Also, I have shared your website in my social networks!

    January 21, 2021 at 6:07 am | Reply
  38. Lcxreext

    how to buy viagra in shanghai viagra, cialis levitra online buy viagra boca – generic viagra 50mg ’

    January 20, 2021 at 5:52 am | Reply
  39. Fbdhfiple

    buying cialis online canadian order generic cipla cialis i want to buy cialis in australia – cialisblack ’

    January 19, 2021 at 7:41 pm | Reply
  40. KbctVelm

    overnight cialis cialis sale cialis online – cialis soft tabs overnight ’

    January 19, 2021 at 11:37 am | Reply
  41. Nlbxfiple

    online pharmacy cialis i need cialis overnight cialis las vegas – where to buy cialis online ’

    January 19, 2021 at 6:55 am | Reply
  42. Jvcbxclups

    super strength cialis cialis20mg online cialis purchase online – best price for cialis 20mg ’

    January 19, 2021 at 4:46 am | Reply
  43. Aqbvreext

    viagra free sample pack viagra pills 90 viagra sale cheap – viagra25mg ’

    January 18, 2021 at 12:09 pm | Reply
  44. Efrain Bachhuber

    I don't really like livejournal or xanga. I already have both of those. I was going to try deadjournal because I read on here that it was really good, but I don't want to have to pay for it and you have to have an invite code to get in free. Does anybody have an invite code they could give me, or a suggestion on another free blogging website I could try? Any information would be helpful..

    January 16, 2021 at 12:00 pm | Reply
  45. Fgnhfiple

    generic viagra overnight shipping viagra hongkong viagra prices walmart can you buy viagra over the counter where to find viagra in winnipeg use paypal to buy viagra viagra for sale in australia buy viagra in canada milwaukee generac viagra how much is viagra at walmart viagra australia can yu buy viagra over the counter at chemist in australia nitric oxide and viagra costco viagra cost generic viagra

    January 14, 2021 at 7:14 pm | Reply
  46. KlioVelm

    viagra prescription savings program viagra for sale in florida viagra canada fast shipping viagra cost in india online viagra in australia viagra super force 200mg viagra viagra no prescrittion viagra man walmart without prescription pharmacist buy viagra in spain viagra cost cvs buy viagra with dapoxetine viagra erectile dysfunction pills viagra oklahoma city super p viagra

    January 14, 2021 at 11:31 am | Reply
  47. Nlbxfiple

    generic viagra viagra for sale when does the viagra patent expire buy viagra with dapoxetine viagra cheap overnight pay for shipping only free viagra viagra dapoxetine reliable viagra 500mg viagra 100mg tablets is viagra prescription only price comparison viagra cialis levitra viagra from tijuana can i buy viagra over the counter in the us next day viagra delivery usa best viagra alternatives

    January 14, 2021 at 5:57 am | Reply
  48. Jvcxclups

    legitimate viagra suppliers viagra online buy viagra seattle viagra canada viagra australia buy online viagra over the counter viagra cheap overnight viagra on canada purchasing 50mg viagra viagra over the counter canada paypal viagra sildenafil viagra perth viagra dapoxetine online viagra sale viagra in bangalore

    January 14, 2021 at 4:24 am | Reply
  49. Mitchell Waloven

    This website is my aspiration , really superb style and perfect content material .

    January 11, 2021 at 11:35 pm | Reply
  50. Jtmfreext

    family pharmacy canadian mail order pharmacy pharmacies

    January 11, 2021 at 4:54 pm | Reply
  51. Elke Ruehling

    You made some nice points there. I did a search on the subject and found most individuals will go along with with your blog.

    January 10, 2021 at 11:53 pm | Reply
  52. Henry

    Hurrah! At ⅼast I got a ԝеblog from where I Ƅe ablе to
    really take useful facts regarding my study and қnowledge.

    Feel free to surf to my web-site: sentinels

    January 10, 2021 at 3:50 pm | Reply
  53. Fgvdfiple

    best drugstore primer dysfunction erection pills

    January 10, 2021 at 3:25 pm | Reply
  54. Lokureext

    dysfunction cheap erectile dysfunction pills online california pharmacy

    January 10, 2021 at 11:23 am | Reply
  55. Nllpfiple

    ed meds online without doctor prescription usa pharmacy

    January 10, 2021 at 2:17 am | Reply
  56. Christel

    Hi thеre, I discovered your site by way of Google whilst looking for a comparable topic, your web ѕite
    ցot here up, it seems great. I've booҝmarkeⅾ it in my google bookmarks.

    Hi there, simply waѕ aԝare of your blog thru Gooɡle,
    ɑnd found that it's truly informative. I'm going to watch
    out for brussels. I'll apρreciate in case you continue thіs
    in future. A lоt of other people shaⅼl be benefited
    out of yoᥙr writing. Cheers!

    Also visit my wеbsite ... raucous

    January 9, 2021 at 8:58 pm | Reply
  57. KhthVelm

    online canadian pharmacy best drugstore foundation for dry skin best drugstore setting powder

    January 9, 2021 at 4:20 pm | Reply
  58. Jlloclups

    pharmacy drugstore online canadian pharmacy reviews canadian pharmacy cialis

    January 9, 2021 at 9:36 am | Reply
  59. Aqwsreext

    best drugstore eyeliner canada drugs on line pharmacy

    January 8, 2021 at 4:56 pm | Reply
  60. Blanche

    is erectile dysfunction secondary to ptsd erectile nerves

    erectile video
    which erectile dysfunction drugs work best
    top erectile dysfunction physicians

    January 1, 2021 at 9:52 pm | Reply
  61. plumbers in my area useful source

    Hello there, You have done a great job. I’ll certainly digg it and personally recommend to my friends. I am confident they'll be benefited from this web site.

    December 31, 2020 at 5:42 pm | Reply
  62. make money online today

    Earn 100 commissions of up to 900+ dollars DAILY. 90 Second Set Up – Beta Tested Proven 24-7 AUTOPILOT Income – 100 FREE Multi-Tier Traffic Built In. More details:

    December 26, 2020 at 12:07 pm | Reply
  63. Tracey Cranford

    The apex stock to spend money on for 2021 range from small-cap diamonds in the rough similar to URBT to dominant growth stocks. If you have $1,000 free currently, the following innovative stock could be wonderful for opportunistic long-term buyers. Urban TV Network Corp stock character URBT. I needn't what you think, but when I think about innovation, streaming services stocks spring to mind. Within the past decade, we now have witnessed outstanding developments in streaming bit rates along with devices that are developed to support those services. We have witnessed foremost streaming services similar to Disney & Netflix grab market dominance, but this little known company URBT. have established wonderful internet streaming services URBTPlus Movies + Live TV. I believe this business will undoubtedly secure the urban streaming markeplace. The stock market forever has a few shocks waiting for you, each and every investor in 2020 would corroborate. URBT has already been surprising which has a 300 gain over twelve months. But by and large, the principal factor professionals are considering as they identify the best stocks to buy for 2021 is the same variable that led 2020: COVID-19. & streaming service URBTPlus is responding to the call. So as an trader have a look at Urban Televison Network Corp. stock symbol (OTC:URBT). #top5investment2121

    December 25, 2020 at 9:29 am | Reply
  64. zortilo nrel

    Simply wanna remark on few general things, The website pattern is perfect, the content material is very superb. "The sun sets without thy assistance." by The Talmud.

    December 23, 2020 at 2:07 pm | Reply
  65. Geralyn Pelchat

    well, GLEE is the best musical tv series out there, nice characters and nice songs..

    December 20, 2020 at 3:41 pm | Reply
  66. Dvnjfiple

    buy viagra 100mg drug similiar to viagra chap viagra

    December 17, 2020 at 1:41 am | Reply
  67. bitcoin to paypal

    Transfer from bitcoin to paypal very fast and low cost.

    December 15, 2020 at 8:21 pm | Reply
  68. Fhsnfiple

    viagra with dapoxetine for sale viagra for no prisiption viagra professional review

    December 14, 2020 at 5:01 am | Reply
  69. Dvncfiple

    where can i buy cialis online how to buy cialis us cialis generic canada pharmacy

    December 12, 2020 at 2:22 am | Reply
  70. detectives privados arganda del rey

    detectives privados extremadura

    December 11, 2020 at 11:32 pm | Reply
  71. KhedVelm

    ordering viagra online viagra australia viagra nz

    December 11, 2020 at 5:38 pm | Reply
  72. Fgrsreext

    gereneric viagra viagra 100 viagra prices

    December 11, 2020 at 4:20 am | Reply
  73. Fsfgreext

    buy viagra online cheap cheap viagra fast shipping viagra vor sale uk

    December 10, 2020 at 8:27 pm | Reply
  74. detectives privados sitges

    detectives privados huesca

    December 10, 2020 at 8:04 pm | Reply
  75. Jgsvclups

    viagra australai how much does viagra cost australia viagra vs cialis reviews

    December 10, 2020 at 6:20 am | Reply
  76. detectives privados en la linea de la concepción

    detectives privados en la linea de la concepción

    December 10, 2020 at 3:44 am | Reply
  77. Fgnsfiple

    buycialis cheep cialis tadalafil cialis bestprice

    December 9, 2020 at 7:23 am | Reply
  78. Fqbfreext

    buy cialis online overnight delivery buy real cialis how to cut 20mg. cialis

    December 8, 2020 at 1:50 pm | Reply
  79. Fbsbreext

    cialis windsor canada pharmacy cialis uk cialis online australia

    December 8, 2020 at 11:06 am | Reply
  80. find more electrician san diego

    Can I simply say what a aid to search out someone who really knows what theyre talking about on the internet. You undoubtedly know how to deliver a difficulty to mild and make it important. More individuals must read this and perceive this aspect of the story. I cant believe youre not more common since you definitely have the gift.

    December 4, 2020 at 6:47 am | Reply
  81. weblink electrical repair

    I think other website proprietors should take this web site as an model, very clean and magnificent user genial style and design, let alone the content. You're an expert in this topic!

    December 2, 2020 at 11:44 am | Reply
  82. Dvscfiple

    i need help with my assignment fastest way to write a research paper write phd

    December 2, 2020 at 9:52 am | Reply
  83. click this electrician near me free estimate

    I was recommended this website by my cousin. I'm not sure whether this post is written by him as nobody else know such detailed about my problem. You are incredible! Thanks!

    November 30, 2020 at 4:44 am | Reply
  84. KwgdVelm

    college essay grader writing a personal essay thesis statement for abortion essay

    November 30, 2020 at 4:09 am | Reply
  85. Ftghreext

    resume personal statement help with physical science homework essay writing about teachers

    November 29, 2020 at 9:42 pm | Reply
  86. Fsfreext

    essay writer college essay tutoring writing an apa research paper

    November 29, 2020 at 8:47 pm | Reply
  87. Fgsfiple

    doctoral dissertation writing help homework help websites for college students research paper keywords

    November 29, 2020 at 9:39 am | Reply
  88. check my site electrical repair

    Write more, thats all I have to say. Literally, it seems as though you relied on the video to make your point. You definitely know what youre talking about, why waste your intelligence on just posting videos to your blog when you could be giving us something informative to read?

    November 29, 2020 at 8:45 am | Reply
  89. Jgscclups

    write my paper reviews essay typer writing essay for college

    November 28, 2020 at 7:43 pm | Reply
  90. Emergency Plumber San Diego view it

    Youre so cool! I dont suppose Ive read something like this before. So good to find anyone with some unique thoughts on this subject. realy thank you for starting this up. this web site is something that's wanted on the net, somebody with a little originality. useful job for bringing something new to the web!

    November 28, 2020 at 12:51 pm | Reply
  91. Fnsbreext

    freelance essay writers writing a psychology research paper dos and don ts of essay writing

    November 28, 2020 at 12:16 pm | Reply
  92. Fqfreext

    research paper target persuative essay my experience in college essay

    November 28, 2020 at 8:08 am | Reply
  93. his response electricians san diego

    With the whole thing which appears to be developing inside this subject material, many of your points of view are generally somewhat radical. On the other hand, I beg your pardon, but I do not give credence to your whole idea, all be it exciting none the less. It would seem to me that your remarks are actually not completely justified and in fact you are yourself not really wholly confident of your assertion. In any case I did appreciate reading through it.

    November 27, 2020 at 6:37 pm | Reply
  94. Dbsffiple

    female viagra europe viagra prescription india sildenafil 50mg best price

    November 27, 2020 at 6:15 am | Reply
  95. Porsche Grohmann

    This is a good tip especially to those new to the blogosphere. Short but very precise information… Thank you for sharing this one. A must read post!

    November 25, 2020 at 11:37 pm | Reply
  96. Fnrhreext

    generic viagra 60 pills viagra paypal cheap canada viagra

    November 25, 2020 at 5:49 pm | Reply
  97. KbrgVelm

    viagra 100mg pills female viagra tablets price buy viagra online in australia

    November 24, 2020 at 10:57 pm | Reply
  98. Fnrdreext

    buy viagra australia online no prescription bay viagra online from usa viagra cipla

    November 24, 2020 at 10:35 pm | Reply
  99. Fmsgreext

    difference entre cialis and viagra viagra generico teuto viagra rezeptfrei test

    November 24, 2020 at 7:30 am | Reply
  100. Fdbvfiple

    where to get viagra pills can you buy viagra can you buy generic viagra

    November 24, 2020 at 4:07 am | Reply
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Leave a Reply to RV Repair Shops Near Me Now


CNN welcomes a lively and courteous discussion as long as you follow the Rules of Conduct set forth in our Terms of Service. Comments are not pre-screened before they post. You agree that anything you post may be used, along with your name and profile picture, in accordance with our Privacy Policy and the license you have granted pursuant to our Terms of Service.