Thursday, September 28, 2017

EarthSky News - Sept 28 - Black Holes with Ravenous Appetites

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Black holes with ravenous appetites
Both Type I and Type II active galaxies have central, supermassive black holes, which consume the galaxies from within. But new work suggests the black holes in Type I's eat faster.
Passing spacecraft snaps Earth's pic
The OSIRIS-REx spacecraft received a gravity boost from Earth on September 22, in the process creating this new Earth portrait.
Did dino-killing asteroid speed bird evolution?
A study suggests the asteroid that wiped out the dinosaurs 66 million years ago also increased the pace of evolution in birds, their only remaining descendants.
Tonight … Meet Fomalhaut, the loneliest star
Go outside around mid-evening, and learn to keep company with the loneliest star.
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Fomalhaut, the loneliest star
If you're in North America, or at a similar latitude, look southward for Fomalhaut. Southern Hemisphere? Look overhead. In its large patch of sky, it'll be the only brightly shining star.
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Passing spacecraft snaps Earth pics
The OSIRIS-REx craft is now over a million miles past Earth, headed toward asteroid Bennu in 2018.
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Wednesday, September 27, 2017

EarthSky News - Sept 27 - How Fast is Our Universe Expanding?

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How fast is our universe expanding?
Here's a great New ScienceCast video about the controversial Hubble Constant. It's the key to knowing the age of our universe and much more.
Where's the moon? 1st quarter
The upcoming full moon on October 5 will be the Harvest Moon.
Tonight … 1st quarter moon points to Saturn
Plus, how the 1st quarter moon happens at the instant of east quadrature, when the moon is 90 degrees east of the sun.
Harvest Moon: All you need to know
The Northern Hemisphere's autumn equinox was September 22. Harvest Moon - the full moon closest to this equinox - is coming up October 5.
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1st quarter moon points to Saturn
The terminator line - or line between light and dark on the moon - is more or less straight Wednesday evening, as seen from around globe. Notice the lighted portion of the 1st quarter moon points to the planet Saturn.
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Crop circles seen from space
An astronaut aboard the International Space Station captured this photo of circular farming patterns in southwestern Egypt.
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