Wednesday, June 13, 2018

Tuesday, June 12, 2018

Black Holes, Galaxy Mergers, Quasars: A Quest to Understand the Ordinary

There are more than 100 billion galaxies in the universe, according to most estimates. Some estimates go as high as 2 trillion (a “2” followed by 12 zeros). Whether hundred billion or trillion, the fact is that there are a lot of galaxies. Most of us, on this tiny planet orbiting a random star in an average-sized galaxy, imagine black holes and galaxy collisions to be rare and exotic. They’re not.

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Friday, June 08, 2018

Questioning Assumptions: Have Binary Stars Been Tricking us into Overestimating the Age of Clusters?

For decades, astronomers have puzzled over the age of globular clusters, heavenly objects made up of hundreds of thousands of stars, living and dying together as they travel through their galaxies. They tend to shine red, indicating that their stars are ancient; in fact, their accepted age is somewhere between 10 and 14 billion years. This is only slightly younger than the Universe itself (13.7 billion years)—which begs the question, how could such complex objects form so soon after the Big Bang? Stars need time to form and drift together into clusters, and gravity works slowly at large scales.

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Thursday, June 07, 2018

This Next-gen Material Can Only be Made in Zero-G

It sounds crazy, but one company is trying it...and it looks like it's going to work.

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