Hubble at 25: My picks
For the Hubble space telescope's 25th anniversary (April 24, 2015), NASA released a picture of the Westerlund 2 star cluster that the telescope shot. The image shows an expanding shell of gas lit…
Butterfly Nebula
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Get to the bottom of it
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For the Hubble space telescope's 25th anniversary (April 24, 2015), NASA released a picture of the Westerlund 2 star cluster that the telescope shot. The image shows an expanding shell of gas lit…