关于这张图
This artist's concept puts solar system distances -- and the travels of NASA's Voyager 2 spacecraft -- in perspective. The scale bar is in astronomical units, with each set distance beyond 1 AU representing 10 times the previous distance. One AU is the distance from the Sun to Earth, which is about 93 million miles, or 150 million kilometers. Neptune, the most distant planet from the Sun, is about 30 AU. Much of the solar system is actually in interstellar space. Informally, the term "solar system" is often used to mean the space out to the last planet. Scientific consensus, however, says the…
