--- title: NASA's One-Year Mission with Mark and Scott Kelly description: The Kelly twins--one in orbit and one on Earth--may help NASA unlock the secret of long-term space travel canonical: https://time.com/3643775/mission-twinpossible/ author: Jeffrey Kluger article:opinion: false article:content_tier: free article:published_time: 2014-12-22T14:21:55.000Z article:modified_time: 2026-02-22T03:03:22.179Z article:section: Science og:title: NASA's One-Year Mission with Mark and Scott Kelly og:description: The Kelly twins--one in orbit and one on Earth--may help NASA unlock the secret of long-term space travel og:url: https://time.com/3643775/mission-twinpossible/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blta7c7fc7b27dcfd7e/69876f83428a9e17b7cc625c/kellytout.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 2100 og:image:height: 1181 og:image:alt: kellytout og:type: article twitter:card: summary_large_image twitter:title: NASA's One-Year Mission with Mark and Scott Kelly twitter:description: The Kelly twins--one in orbit and one on Earth--may help NASA unlock the secret of long-term space travel twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blta7c7fc7b27dcfd7e/69876f83428a9e17b7cc625c/kellytout.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Meet the Twins Unlocking the Secrets of Space > Sponsored content. 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It reaches 40,000 subscribers with a 34.2% open rate and a 2.1% click rate as of August 2026. #### Where can I follow the energy transition as a business story? Future Proof covers climate and energy as an economic and business story rather than only an environmental one. It publishes every Friday and is free at time.com/newsletters. #### Who writes Future Proof? Justin Worland, a senior correspondent at TIME and an award-winning climate journalist, writes Future Proof. #### Is Future Proof free? Yes. Future Proof is free at time.com/newsletters.  by [Jeffrey Kluger](https://time.com/author/jeffrey-kluger/)  ## Jeffrey Kluger Editor at Large Dec 22, 2014 2:21 PM UTC  Photograph by Marco Grob for TIME  by [Jeffrey Kluger](https://time.com/author/jeffrey-kluger/)  ## Jeffrey Kluger Editor at Large Dec 22, 2014 2:21 PM UTC When Scott Kelly calls home from the International Space Station (ISS) sometime next year, whoever answers the phone may simply hang up on him. The calls will be welcome, but the link can be lousy, with long, hissing silences breaking up the conversation. That’s what happens when you’re placing your call from at least 229 mi. (369 km) above the Earth while zipping along at 17,500 m.p.h. (28,164 kph) and your signal has to get bounced from satellites to ground antennas to relay stations like an around-the-horn triple play. “When someone answers, I have to say, ‘It’s the space station! Don’t hang up!'” says Kelly… [**Read the full story here.**](http://time.com/meet-the-twins-unlocking-the-secrets-of-space/) ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/3643775/mission-twinpossible/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/3643775/mission-twinpossible/"},"headline":"Meet the Twins Unlocking the Secrets of Space","datePublished":"2014-12-22T14:21:55.000Z","dateModified":"2026-02-22T03:03:22.179Z","description":"The Kelly twins--one in orbit and one on Earth--may help NASA unlock the secret of long-term space travel","url":"https://time.com/3643775/mission-twinpossible/","keywords":[],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blta7c7fc7b27dcfd7e/69876f83428a9e17b7cc625c/kellytout.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Jeffrey Kluger","jobTitle":"Editor at Large","url":"https://time.com/author/jeffrey-kluger/"}],"articleSection":"Science","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blta7c7fc7b27dcfd7e/69876f83428a9e17b7cc625c/kellytout.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"kellytout","caption":"","creditText":"Photograph by Marco Grob for TIME","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/science/","name":"Science"}},{"@type":"ListItem","position":2,"item":{"@id":"https://time.com/3643775/mission-twinpossible/","name":"Meet the Twins Unlocking the Secrets of Space"}}]}] ```