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April 9, 2018 - Bubble, by Hubble

Bubble, by Hubble  The Bubble Nebula, seven light-years wide, is 7,100 light-years away in the constellation Cassiopeia. The star forming this nebula has 45 times the mass of the Sun. The star heats gas that escapes as a “stellar wind” that is moving millions of kilometers per hour. This outflow sweeps up the cold, interstellar gas in front of it, forming the outer edge of the bubble much as a snowplow piles up snow in front of it as it moves forward. The expanding shell slams into dense regions of cold gas on one side of the bubble. This asymmetry makes the star appear off-center from the bubble, in the ten o’clock position in this Hubble view. Dense pillars of cool hydrogen gas laced with dust appear at the upper left of the picture, and more “fingers” can be seen nearly face-on, behind the translucent bubble.

Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

Weekly Calendar

April 9 - 15, 2018

Holidays - Sky Events - Space History

 

Monday 9

1959: NASA selects original seven Mercury astronauts
1994: STS-59 Endeavour launched

Tuesday 10

1919: John C. Houbolt born

Wednesday 11

1960: Project Ozma started
1970: Apollo 13 launched
1980: Viking 2 lander mission ends
1984: Challenger retrieves Solar Max
1986: Halley’s Comet closest to Earth

Thursday 12

Yuri's Night World Space Party

Neptune 1.9° north of Moon

1961: Yuri Gagarin first human in space
1981: STS-1 Columbia launched
1985: STS-51D Discovery launched

Friday 13

Saturday 14

Mercury appears stationary
Mercury 4° north of Moon

1629: Christiaan Huygens born
1972: KSC and Vandenberg AFB picked as shuttle launch sites
1981: STS-1 Columbia lands
2005: Expedition 11 crew launched to International Space Station

Sunday 15

New Moon 9:57 PM ET

1999: Landsat 7 launched

Suggestions for new history dates or better links? Corrections for errors on this page? Please e-mail me.