Category Archives: astronomy

astronomy research, astrophysics, cosmology, evolution of galaxies, galaxies, galaxy interactions

Galaxies Can’t Do that, Can They?

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It Turns Out They Do… All Over the Place

Back before astronomers had high-resolution cameras and spectrographs and orbiting spacecraft to look at the distant universe, interacting galaxies were just plain weird. They didn’t fit into the standard scheme of galaxies as set out by the venerable giant of astronomy, Edwin Hubble. Every astronomer worth his (and sometimes a few “her”) salt memorized the Hubble tuning fork diagram and tried to fit every galaxy observed somewhere in this hierarchy.

Trouble is, not all galaxies “played the game.” Some of them looked downright pathological, twisted up, or misshapen or something. But the problem was that until we could look at these galactic weirdos with good optics and high-resolution spectrographs, astronomers couldn’t really tell what was going on with many of them.

That’s why the monumental set of galaxies that Hubble Space Telescope and other high-resolution ground-based observatories have observed over the years is such a great achievement. For the first time, astronomers can see what’s happening. And, they’re finding galaxy interactions (collisions, if you will) all over the place. The fact that we’re seeing them nearly everywhere we point a telescope to tells us that collisions aren’t just oddball occurrences in the universe. They’re part of an evolutionary process that shapes galaxies and triggers star formation in the process.

Our own Milky Way is actually cannibalizing smaller galaxies as you read this. The Sloan Digital Sky Survey is tracing out the streams of stars that are pouring into our galaxy as these smaller galaxies interact with the Milky Way. Here’s what it looks like from our vantage point inside the Milky Way.

Galaxy interaction is a hot topic in astronomy these days as the folks researching these cosmically titanic events dig into the details. Stay tuned!

astronomy

Taking Time for Astronomy: Why Do It?

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Because It Takes You Places You’ll Never Go

Star-forming region NGC 3582

T. A. Rector (U. Alaska), T. Abbott, NOAO, AURA, NSF

Courtesy Astronomy Picture of the Day

A few weeks ago I was flying to a meeting across the country. I always bring along some reading material, since it doesn’t take me more than 10 minutes to get through the airline magazine. I sat there reading a copy of Physics Today,. After I put it down to rest my eyes a bit, the person sitting next to me looked it over and smiled. “I always hated physics,” was the comment. I patted the magazine and said, “I flunked it once. But I went back and took it again because physics describes how things work. And that fascinates me.”

We kept talking for a while, and eventually my seatmate asked what I do for a living. I never quite know what to say because I’ve done a great many things. I’m a writer, for sure. But, to get here, I had to go a lot of other places. I’ve been in astronomy research, worked at a newspaper (where I agitated to write more stuff about astronomy), edited a magazine (about astronomy), written books (about astronomy), write scripts (about astronomy) and… well, you get the picture. So, I said that I write about astronomy. That led to another question, “Why do that? Are you into it?”

Now, these questions aren’t asked maliciously–the person really does want to know. So, we got into a discussion about astronomy, how I first got started, and how I work to spread the word about astronomy these days. And, I got in a few points about how astronomy is a great science for everybody to appreciate. My seatmate mentioned going out stargazing with family members as a child. And talked a little about going to the planetarium for school visits. And then said, “What I like about astronomy are the pictures. I don’t always understand them, but I like them.”

I asked why, and after pondering a while, my airplane friend said, “Because they take me places I could never go.”