Gravity

Tag archives for Gravity

Black Hole Kicked Out of Galaxy

No, not because it was too young to drink! Scientists at the Max Planck Institute for Extraterrestrial Physics were looking at some X-ray objects, and discovered something really weird: a very bright X-ray source moving out of a galaxy at nearly 3,000 kilometers/second! This thing is a goner. If our Sun were moving at even…

Why Do We Only See One Side of the Moon?

And if the band you’re in starts playing different tunes I’ll see you on the dark side of the Moon. One of my favorite readers, Zrinka, asks us why we’re only able to see one side of the Moon from Earth. Seriously, look at the different phases; we always see the same side of the…

Weekend Diversion: A Fun Online Game!

Sometimes, gravity and motion has the power to mesmerize me. I found this online game called “compulse” which was so much fun, that I spent about 90 minutes this week just playing this game until I had beaten every level on the “pro” setting. Yikes. (My score is 104 under par, 8 under pro.) And…

Gravitational Waves: Inflation or not?

Nothing gets past you, does it? A scientific paper came out earlier this week, and I took a look at it, sighed, and Jamie asked me, “What?” And I said to her, “When I see bad science, it just makes me a little bit frustrated and sad.” Of course, I had no intention to write…

Q & A: On String Theory

Over the past few months, I have been asked a number of questions about String Theory and the Universe, including from readers Benhead and Mastery Mistery. But now Jamie, whom I’m going to marry later this year, has been asking me about it, and so it’s time to write something about the scientific topic of…

Somethin’ Neat about our Galaxy

So last week I was up at Pacific University in Portland, OR for a job interview. As part of a faculty interview, you have to lecture on a topic for undergraduates, but they give you the topic just a couple of days before. My topic was Gauss’ Law, which talks about the relationship between an…

Why we need Dark Matter in the Universe.

Last week, Pamela Gay over at Star Stryder pointed me to a press release which claimed that, among other things, perhaps dark matter wasn’t necessary. So I wrote a guest post on her blog explaining why it was. Apparently, some people still aren’t convinced. So I will lay out for you all the reasons I…

What if I were made of Dark Matter?

I’ve been talking about dark matter a lot, and yet there’s still so much to explain about it. For example, dark matter and normal matter (protons, neutrons, and electrons) have a few things in common: They both have mass. They both feel the effects of gravity. They both cause their own gravity. But that’s where…

Galaxies are made exactly how, now?

Last week, Jamie (my significant other) came home from work and told me about a conversation she had with her coworker, Chris. This week she asked another one, Miguel, whether he had any questions about Astronomy, Physics, space, etc. This week’s question comes from Miguel: What is a galaxy, anyway? Why does it look like…

How to Build a Home in Space

Ever get sick of your life here on Earth? What about really getting away from it all; what if you wanted to live in space, orbiting the Earth, away from everyone. (At least for awhile, like a summer home.) What would you need to do it, and what would it consist of? I propose an…