When Galaxies Collide, Black Holes Don’t Always Get the Feast They Were Hoping for

What happens when galaxies collide? Well, if any humans are around in about a billion years, they might find out. That’s when our Milky Way galaxy is scheduled to collide with our neighbour the Andromeda galaxy. That event will be an epic, titanic, collision. The supermassive black holes at the center of both galaxies will feast on new material and flare brightly as the collision brings more gas and dust within reach of their overwhelming gravitational pull. Where massive giant stars collide with each other, lighting up the skies and spraying deadly radiation everywhere. Right?

Maybe not. In fact, there might be no feasting at all, and hardly anything titanic about it.

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About 3% of Starlinks Have Failed So Far

Starlink

SpaceX has drawn plenty of praise and criticism with the creation of Starlink, a constellation that will one-day provide broadband internet access to the entire world. To date, the company has launched over 800 satellites and (as of this summer) is producing them at a rate of about 120 a month. There are even plans to have a constellation of 42,000 satellites in orbit before the decade is out.

However, there have been some problems along the way as well. Aside from the usual concerns about light pollution and Radio Frequency Interference (RFI), there is also the rate of failure these satellites have experienced. Specifically, about 3% of its satellites have proven to be unresponsive and are no longer maneuvering in orbit – which could prove hazardous to other satellites and spacecraft in orbit.

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Astronomers See the Wreckage from a Collision Between Exoplanets

The history of our Solar System is punctuated with collisions. Collisions helped create the terrestrial planets and end the reign of the dinosaurs. And a massive collision between Earth and an ancient body named Theia likely created the Moon.

Now astronomers have found of evidence of a collision between two exoplanets in a distant solar system.

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Weekly Space Hangout – February 7, 2014: New Impact on Mars & A Wobbly Planet

Host: Fraser Cain
Astrojournalists: Scott Lewis, Nicole Gugliucci, Morgan Rehnberg, Brian Koberlein, Elizabeth Howell, Amy Shira Teitel, David Dickinson

This Week’s Stories!

Morgan Rehnberg (cosmicchatter.org / @cosmic_chatter):
New Mars impact crater

Nicole Gugliucci (cosmoquest.org / @noisyastronomer):
Weird Asteroid Itokawa Has a Dual Personality
Shiny new radio image of M82 (but no supernova afterglow)

David Dickinson (@astroguyz):
Venus in 2014
Progress+launches for February
Space History-Curious Artifacts Sent Into Space

Elizabeth Howell (@howellspace):
Astronomy Podcast Enters Sixth Year — And We’d Love For You To Contribute!
Super-Earths Could Be More ‘Superhabitable’ Than Planets Like Ours

Brian Koberlein (@briankoberlein); Scott Lewis (@baldastronomer); & Elizabeth Howell (@howellspace):
‘Wobbly’ Alien Planet Has Weird Seasons And Orbits Two Stars

Amy Shira Teitel (@astVintageSpace):
When galaxies collide!

Scott Lewis (@baldastronomer):
Gaia

We record the Weekly Space Hangout every Friday at 12:00 pm Pacific / 3:00 pm Eastern. You can watch us live on Google+, Universe Today, or the Universe Today YouTube page.