Tag Archives: astronomy

Interstellar Seeds Could Create Oases of Life

In 2004 I wrote a short piece for my local newspaper in which I speculated about the possibility of comet impacts splashing chunks of Earth back into space, and some of the life in those chunks surviving long enough to … Continue reading

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Cap Cloud

Cloud of the Day – Cap Cloud Cap cloud (link to a super photo on the Astronomy Photo of the Day website) is similar to pileus in that it forms on top of another structure. In the case of pileus, … Continue reading

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Zodiacal Light

Cloud of the Day – Zodiacal Light Brian May played guitar for Queen. That’s Queen, not The Queen, although Queen might have played for The Queen. I don’t know. It seems unlikely, though. On the other hand, Brian May was … Continue reading

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Solstice – Reprise

In Ireland there is a stone structure called Newgrange which has been dated to more than 5,000 years before present. This megalith – literally, big stone thing – is built in a circle, like its famous English cousin, Stonehenge. Both … Continue reading

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Aurora

Cloud of the Day – Aurora Aurora is not clouds. Clouds can’t form in the tenuous wisps of atmosphere found at the heights, approximately 90 – 1,000 kilometers, where aurora occurs. Therefore, it is wrong for me to call aurora … Continue reading

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Size – Solar System

The American National Optical Astronomy Observatory has provided a model that can be used to visualize the size of the Solar System. Various objects are used to represent the Sun and planets, such as a ball for the Sun and … Continue reading

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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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