Gizmodo has an interesting article that someone asked my thoughts on. Part of their "Giz asks" series, it asks various physicists what's at the edge of the universe? The physicists polled include Sean Carroll, Jo Dunkley, Jessie Shelton, Michael Troxel, Abigail Vieregg, and Arthur B. Kosowsky. They all give similar answers, that space isn't known … Continue reading What’s at the edge of the universe?
The other day, I was reading a post by Ethan Siegel on his excellent blog, Starts With a Bang, about whether it makes sense to consider the universe to be a giant brain. (The short answer is no, but read his post for the details.) Something he mentioned in the post caught my attention. But … Continue reading 97% of the observable universe is forever unreachable
Every so often you get a reminder of how little we know about the universe: Rogue stars outside galaxies may be everywhere | Science/AAAS | News. You’ve heard of rogue planets, floating through the universe untethered to any solar system. Now meet rogue stars, which drift through space with no galaxy to call home. A new … Continue reading Half the stars in the universe may exist outside of galaxies
I did a post a few weeks ago explaining why I'm not much of a fan of the "Why is there something rather than nothing?" question. So, when this TED talk popped up later, I resisted watching it, thinking it would just be a rehash of the standard hand wringing. I guess you could still characterize … Continue reading Jim Holt: Why does the universe exist?
The radius of the observable universe is often stated to be 46 billion light years. From a certain point of view, this is true, but I think it's a bit of a misleading statement. Occasionally you also see people say that the observable universe is 13.8 billion light years in radius, which is also true, from … Continue reading The size of the observable universe is complicated.
This a cool video on what we are and where we came from. We are, each of us, a temporary intersection of matter and energy that is part of the overall whole of the universe, patterns of elementary particles that have, at least for a while, achieved self awareness. http://www.youtube.com/watch?v=PKMQzkIiB0Y via Are You Alone? In The … Continue reading Are you alone? (In the universe)
Ethan Siegel has an excellent post up contemplating the various models of the timeline of the universe. It’s only human to ask the most fundamental of all questions: where did all this come from? And we like to think we know the answer; it all came from the beginning. But if you think about it … Continue reading The theoretical preference for a timeless and eternal reality
THE multiverse is dead, long live the multiverse. A radical new way of looking at quantum mechanics suggests that even the multiverse will come to an end. A popular view of the multiverse says that our universe is just one of an ever-inflating multitude of discrete "bubble" universes. These bubbles are eternally budding off new … Continue reading Quantum twist could kill off the multiverse, and Boltzmann brains
The question I've asked multiple times lately. Is the universe math, or math the universe? (Click through for full sized version.) via Saturday Morning Breakfast Cereal.
A slightly different point of view on the mathematical universe, as only Zach Weiner can deliver. (Click through to see the full sized version.) via Saturday Morning Breakfast Cereal.