[酷图] 拥有类似行星的恒星

2003/7/9
http://antwrp.gsfc.nasa.gov/apod/image/0307/hd70642_pparc.jpg
天文学家发现了一个迄今为止最类似于太阳系的行星系统。位于船尾座的亮星HD70642可用
双筒望远镜看到，这是一颗与太阳相近的恒星。它的一颗2倍木星质量的行星在相当于木星
一半的圆轨道半径上运行。这种轨道使得类地行星有可能被庇护在更小的轨道上运行，这
在之前发现的行星系统中是没有过的。此前的那些大行星处在椭圆轨道上运行，这会导致
其他小行星的分裂。下图是假想在该大行星的一个卫星上看到的情景。由于该系统离我们
仅有90光年，地球上的早期无线电广播正在经过它。

HD70642: A Star with Similar Planets
Illustration Credit & Copyright: David A. Hardy, PPARC
Explanation: Astronomers have discovered a planetary system more similar to ou
r own Solar System than any known previously. The bright star HD70642, visible
with binoculars toward the constellation of Puppis, was already known to be a
star like our Sun. Now a planet with twice Jupiter's mass has been discovered
in a nearly circular orbit at approximately half the orbital distance of Jupi
ter. Such an orbit allows the possibility of habitable Earth-type planets orbi
ting further in, a possibility not likely with all previously discovered plane
tary systems with massive planets occupying disruptive closer elliptical orbit
s. The above illustration indicates what the HD70642 planetary system might lo
ok like from a hypothetical moon orbiting the newly discovered planet. At only
90 light years distant, extremely faint early radio broadcasts from Earth are
now passing this planetary system.

:eek:

你俩贴的是一张图

哪俩？？？

这张图是真的假的？

你连真假都看不出来吗？？？