The Helix Nebula is an example of a planetary nebula. Though it looks like a bubble or eye from Earth's point of view, the Helix is actually a trillion-mile-long tunnel of glowing gases. In its center ...
This breathtaking image of V838 Mon showcases a star located approximately 20,000 light-years from Earth in the Monoceros constellation, situated at the outer edge of the Milky Way galaxy.
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