The other side of black holes

What happens to things that fall into black holes? Here is an admittedly highly speculative head-twisting suggestion published by National Geographic. It offers an explanation "certain features of our universe deviate from what theory predicts, according to physicists." I see that Science has reported on the same theory by the same scientist (BTW, his name is Nikodem Poplawski, and he works at Indiana University in Bloomington).

A long time ago, in a universe much larger than our own, a giant star collapsed. Its implosion crammed so much mass and energy together that it created a wormhole to another universe. And inside this wormhole, our own universe was born. It may seem fantastic, but a theoretical physicist claims that such a scenario could help answer some of the most perplexing questions in cosmology.

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Lots of other planets

Scientists now have evidence of about 400 planets outside of the solar system, including 32 new ones:

European astronomers have found 32 new planets outside our solar system, adding evidence to the theory that the universe has many places where life could develop. Scientists using the European Southern Observatory telescope didn't find any planets quite the size of Earth or any that seemed habitable or even unusual.
And this is the tip of the iceberg. Though not yet established, any reasonable extrapolation would suggest that there are many billions of other planets out there, and that at least some of them would be hospitable to life. Which makes it all the more amazing that out of all of those available planets God chose to send his "only begotten Son" toour planet: Earth. Or is that the point that Carl Sagan was opposing in this video?

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Fun on the frontiers of astronomy

Want to watch/read an entertaining and inspiring three-part discussion covering the frontier of astronomy? All you need to do is follow this link to the article and videos at Discover Magazine. The participants include Saul Perlmutter, Debra Fischer, Mike Brown and Andrea Ghez, in a panel moderated by Discover's Phil Plait. It's lively, accessible and mind-blowing. Here are a few of my favorite quotes: [Debra Fischer]

We started out with a solar system where many planetesimals were forming, and that evolved into a system where all the stable niches are filled. To me that’s one of the most exciting discoveries in this field.

[Mike Brown]

[I]t’s the small objects that really matter. The small ones are little particles that sit in the outer solar system, and they’re gravitationally swept around by planets. The analogy I like is that these objects in the outer solar system are the blood splattered on the wall after some horrendous murder. I love this analogy—it’s disturbing, but I love it. As Debra just suggested, there might have been additional planets that used to be here in our solar system [but were ejected due to gravitational instability]. The bodies have all been removed.

[Andrea Ghez]

The question that I started off with was, I thought, very simple. It was just “Is there a massive black hole at the center of the Milky Way?” But one of the things I love about science is that you always end up with new questions. What happened with my research is that the stars we studied to prove that there was a black hole turned out to be very young. Young stars have absolutely no right to be next to a black hole because a black hole should shear them apart. We have no idea how these stars formed. So that’s one of the major questions we’re trying to address today: “How do baby stars form next to this completely inhospitable object?”

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Another Near Miss

In case you missed it, asteroid 2009 DD45 passed the Earth today at a distance of about 1/7th of the way to the moon. It was noticed about 3 days ago, and apparently has an orbit that will bring it close to home every so often. See here. It is relatively tiny, about 30 meters across. Therefore, when it hits it'll only make a hole a few miles across. Maybe the size of Manhattan or the Greater Chicago area. Yes, when. It'll probably hit in the ocean, in which case only seaside towns will be destroyed, like Miami, D.C, or Los Angeles. But this is only one of thousands that have been discovered so far. No need to worry. When the sky does fall, we'll find out eventually. With a bit of pork barrel spending, we might be able to predict and prevent such things. But it might cost as much as the current bailing out of mismanaged banks. But I've discussed the end of the world before.

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