Located about 2,000 light years from Earth in the constellation Lyra, the Ring Nebula is also known as Messier Object 57 and NGC 6720.
这个星云位于距离地球2000光年的天琴座内，它还有另外两个名字：Messier Object 57和NGC 6720。
Located about 2, 000 light years from Earth in the constellation Lyra, the Ring Nebula is also known as Messier Object 57 and NGC 6720.
这个星云位于距离地球2000光年的天琴座内，它还有另外两个名字：Messier Object 57和NGC 6720。
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