Imaged beautifully by Hubble, NGC 6684 is a 'lenticular' galaxy very different to our own Milky Way.
Where is it?About 44 million light-years away, in the constellation Pavo .
Astronomers categorize galaxies based on their apparent shapes and physical features. NGC 6684's hazy, ghostly shape is an example of a specific type of galaxy called a lenticular galaxy — meaning that when viewed side-on, it looks like a lens, according to NASA. Lenticular galaxies contain older stars than spiral galaxies do, and astronomers think these galaxies could be aging spiral galaxies whose arms have faded, or spiral galaxies that have merged, according to NASA. Indeed, recent evidence suggests that the Milky Way may have been a lenticular galaxy billions of years ago, before a series of galactic collisions shaped its signature spiral arms. Other lenticular galaxies imaged by Hubble recently include NGC 1023, NGC 5283 and NGC 3489.
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