We are the LIGO Scientific Collaboration and the Virgo Collaboration, and we have made a second gravitational wave detection. Ask Us Anything!
Our short bio: Hi Reddit, we will begin answering questions starting 9AM PDT (12 NOON EDT). We have a large team of scientists from many different timezones, so we may continue answering questions overnight. Keep the questions coming!
About the discovery: Yesterday we announced the second direct detection of the collision and merger of two black holes! The black holes merged more than a billion light years away from us, releasing energy in the form of a gravitational wave that reached our detectors on December 26, 2015. One of the initial black holes was 14 times the mass of the sun, the other was 8 times the mass of the sun. The final black hole is 21 times the mass of the sun, with the mass of our sun worth of energy radiated away in the form of gravitational waves! More resources about the discovery are on the LIGO Detection Page.
Who we are: We are a large team, made up of a mix of people with various roles in LIGO, including engineers, research scientists, graduate students, professors, post-docs, and more! We will all sign our responses with initials and a description of our part in LIGO, so feel free to direct questions to specific people. Note that unless stated otherwise, all comments made with this account are personal opinions, and do not represent the position of the LIGO Scientific Collaboration.
Previous AMA: LIGO AMA
Our Proof: Twitter
Edit: 0347 PM EDT: Some of us are signing off now but we will still be answering the odd question until midnight tonight (EDT) so keep asking!
Edit: 1211 AM EDT: Thanks Reddit you've been great. We are signing off now, but feel free to ask us questions on Twitter/Facebook and check out some of the links in this post.