跳转到内容

File:Artist's conception of Kepler-42.jpg

页面内容不支持其他语言。
這個文件來自維基共享資源
维基百科,自由的百科全书

原始文件 (4,268 × 2,400像素,文件大小:1.49 MB,MIME类型:image/jpeg


摘要

描述
English: Mini Planetary System

This artist's concept depicts an itsy bitsy planetary system -- so compact, in fact, that it's more like Jupiter and its moons than a star and its planets. Astronomers using data from NASA's Kepler mission and ground-based telescopes recently confirmed that the system, called Kepler-42 (formerly KOI-961), hosts the three smallest exoplanets known so far to orbit a star other than our sun. An exoplanet is a planet that resides outside of our solar system.

The star, which is located about 130 light-years away in the Cygnus constellation, is what's called a red dwarf. It's one-sixth the size of the sun, or just 70 percent bigger than Jupiter. The star is also cooler than our sun, and gives off more red light than yellow.

The smallest of the three planets, called Kepler-42d (Formerly KOI-961.03), is actually located the farthest from the star, and is pictured in the foreground. This planet is about the same size as Mars, with a radius only 0.57 times that of Earth. The next planet to the upper right is Kepler-42b (formerly KOI-961.01), which is 0.78 times the radius of Earth. The planet closest to the star is Kepler-42c (formerly KOI-961.02), with a radius 0.73 times the Earth's.

All three planets whip around the star in less than two days, with the closest planet taking less than half a day. Their close proximity to the star also means they are scorching hot, with temperatures ranging from 350 to 836 degrees Fahrenheit (176 to 447 degrees Celsius). The star's habitable zone, or the region where liquid water could exist, is located far beyond the planets.

The ground-based observations contributing to these discoveries were made with the Palomar Observatory, near San Diego, Calif., and the W.M. Keck Observatory atop Mauna Kea in Hawaii.
日期
来源 http://www.nasa.gov/mission_pages/kepler/multimedia/images/mini-planetary-system.html
作者 NASA/JPL-Caltech

许可协议

Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
警告:

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描繪內容

image/jpeg

09dc07250cf7107ff20be8c1d16eddf9ae26ca4c

1,559,261 字节

2,400 像素

4,268 像素

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2017年4月15日 (六) 19:472017年4月15日 (六) 19:47版本的缩略图4,268 × 2,400(1.49 MB)Karl432Color corrected. Instead of a strange pink, the star now shines in a RGB value appropriate for a 3100K black body.
2012年1月19日 (四) 13:262012年1月19日 (四) 13:26版本的缩略图4,268 × 2,400(3.21 MB)החבלןFull-size image from source
2012年1月12日 (四) 00:462012年1月12日 (四) 00:46版本的缩略图946 × 710(70 KB)החבלן

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

元数据