Warm, Neptune-Sized Planet (Illustration) : 無料・フリー素材/写真
Warm, Neptune-Sized Planet (Illustration) / NASA Hubble
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | This artist's illustration shows a giant cloud of hydrogen streaming off a warm, Neptune-sized planet just 97 light-years from Earth. The exoplanet is tiny compared to its star, a red dwarf named GJ 3470. The star's intense radiation is heating the hydrogen in the planet's upper atmosphere to a point where it escapes into space. The alien world is losing hydrogen at a rate 100 times faster than a previously observed warm Neptune whose atmosphere is also evaporating away.In 2015, astronomers using NASA's Hubble Space Telescope found that one of the warmest known Neptunes (GJ 436b) is losing its atmosphere. The planet isn't expected to evaporate away, but hotter Neptunes might not have been so lucky.Astronomers have since used Hubble to nab this second "very warm" Neptune (GJ 3470b) that is losing its atmosphere at a rate 100 times faster than that of GJ 436b. Both planets reside about 3.7 million miles from their star. That's one-tenth the distance between our solar system's innermost planet, Mercury, and the Sun.Credit: NASA, ESA, and D. Player (STScI)For more information: hubblesite.org/contents/media/images/2018/52/4275-Image.htmlFind us on Twitter, Instagram, Facebook and YouTube |
| 撮影日 | 2018-11-19 16:20:00 |
| 撮影者 | NASA Hubble |
| タグ | |
| 撮影地 |