Tag Archives: astronomy

Getting Down

Speaking of infrasound, have you ever wondered about the lowest sound? Is there a lowest sound? Is it even reasonable to think about a lower limit to the frequency of sound? Definitions first. I will define sound as pressure waves … Continue reading

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One Minute Astronomy

How much can you learn about astronomy in sixty seconds? The Open University thinks you can learn a lot. Through their open learning initiative on YouTube, they present twelve one minute animated videos narrated by David Mitchell. He’s a comedian, … Continue reading

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Dark Flow

The known universe is about 27.4 billion light years across. It’s thought that the universe is bigger than that, possibly a lot bigger, but we can’t see farther than 13.7 billion light years in any direction. Our knowable universe is … Continue reading

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Solstice

Thud, son of Thog, stood on The Rock watching for the Sun to go down. Behind him burned the fire, which he had kept going for the last week. It was working just as his father said it would. Although … Continue reading

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Interstellar Travel – Part Four

See also parts one, two and three. We’ve covered methods of interstellar travel that are achievable with presently understood technology, such as light sails and generation ships. We’ve also looked at methods that we can’t do yet but might be … Continue reading

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Interstellar Travel – Part Two

See also parts one, three and four. How will we get to the stars? With extreme difficulty. We have enough trouble getting to Mars and it’s right next door. The time it takes light to get from Earth to Mars … Continue reading

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Interstellar Travel

See also parts two, three and four. When astronomers find habitable planets orbiting distant stars it’s going to stimulate a big upsurge in activity. First, to ensure it’s not just a case of wishful thinking, other astronomers are going to … Continue reading

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Cosmological Constant

Albert Einstein didn’t like it. When he worked out his General Theory of Relativity in 1916 he realized that it made for an unstable universe. The General Theory is all about gravity and it has been one of the most … Continue reading

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