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How old is the Sun in Galactic years?
The Moon goes around the Earth, the Earth goes around the Sun, and the Sun goes around the center of the Milky Way. We know the Moon takes about 4 weeks to make its trip around the Earth, and that...
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Cosmic Sound Waves… Rule?
So as a full member of both the American Astronomical Society and the American Physical Society, I get sent issues of the magazine Physics Today. Well, I was going through the April issue, when I saw...
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Another Trip Around the Sun
“How old would you be if you didn’t know how old you are?” –Satchel Paige Today marks another year and another trip around the Sun for me. For you, and me, and everything on Earth that makes it through...
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What is dark energy?
“Because dark energy makes up about 70 percent of the content of the universe, it dominates over the matter content. That means dark energy will govern expansion and, ultimately, determine the fate of...
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The Most Distant Galaxy in the Universe
“People say sometimes that Beauty is superficial. That may be so. But at least it is not so superficial as Thought is. To me, Beauty is the wonder of wonders. It is only shallow people who do not judge...
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Messier Monday: Andromeda, the Object that Opened Up the Universe, M31
“We find them smaller and fainter, in constantly increasing numbers, and we know that we are reaching into space, farther and farther, until, with the faintest nebulae that can be detected with the...
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What does the Universe look like as seen from its most distant galaxy?
“One sees qualities at a distance and defects at close range.” –Victor Hugo A couple of weeks ago we took a look at the most distant galaxy (so far) in the known Universe, a galaxy so far away that it...
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Ask Ethan #11: Why does gravity get weaker with distance?
“I wouldn’t know a spacetime continuum or a warp core breach if they got into bed with me.” –Patrick Stewart It’s the end of the week once again, and so it’s time for another Ask Ethan segment! There...
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