...Hubble bubble The Bubble Nebula is seven light-years across: big enough that it could comfortably hold our solar system, the nearest star system to ours (Alpha Centauri), and all the space in between. It's being blown up by a seething star, 45 times more massive than our Sun—the big purple one near the center of this image. As hot gas escapes from the star as stellar wind, it runs into cold, interstellar gas around it, forming the outer edge of the bubble like a snowplow piling up snow. This nebula was first spotted in 1787 by William Herschel, a prominent astronomer who also discovered the planet Uranus. More than 200 years later, our @NASAHubble telescope captured this image of the Bubble Nebula; it was released in 2016 to mark the 26th anniversary of Hubble's time in orbit. Visit https://go.nasa.gov/4ev4h9I to learn more about the space telescope's ongoing mission—and how you can take part this year in Hubble's Night Sky Challenge! Image description: A big, translucent, blue bubble floats amid a cosmic landscape. A bright purple star shines near its 10 o'clock position, with a few other smaller stars scattered inside and outside the bubble. The background is filled with an orange-yellow haze, with a bright cloud near the top-left corner. Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA) #NASA #Universe #Hubble #Astronomy #Nebula
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