ChrisF
  • Member for 8 years, 3 months
  • Last seen more than a month ago
  • United Kingdom
Why do some planets have rings?
Accepted answer
21 votes

Rings are made up of tiny (and not so tiny) pieces of rock and ice that are in some way the bits "left over" from the formation of the planet. The theory involves the Roche limit - and is that ...

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Space expansion in layman terms
12 votes

A good analogy which shows that the expansion has no centre is one of a 2D sheet covered with uniform dots - representing the galaxies where the one in the centre is us: As the universe expands the ...

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Why is the Moon receding from the Earth due to tides? Is this typical for other moons?
10 votes

You have correctly identified that the tidal forces are transferring energy from the Earth to the Moon. This energy causes the Moon's orbit to get larger thus slowing it down. It's a bit counter ...

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How do I prevent or reduce shake when observing with binoculars?
9 votes

Tripods are good, as are monopods. These aren't as stable as tripods but are easier to lug around as they have 1/3 of the number of legs. When using a monopod you form the other two legs of the "...

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Does the radio signal decay when it travels through the intergalactic space?
8 votes

All electromagnetic radiation from a point source - which a normal radio transmitter is - propagates according to the inverse square law which means that the intensity of the signal is inversely ...

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Why do stars seem not to move relative to each other?
5 votes

They do move - just far too slowly for you to detect by eye even over several human lifetimes. Space is big. Really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean,...

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Do any known exoplanetary/solar bodies have "annular" eclipses similar to Earth's?
5 votes

This will depend the position of the observer and (obviously) the relative sizes of the star and the eclipsing body. For an intelligent observer standing on the surface of a planet the most obvious ...

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Is the expansion of the universe proof of the big bang?
Accepted answer
3 votes

In and of itself, no the expansion of the universe is not proof of the big bang. Other theories could be constructed that would also be explained by the expansion. For example Fred Hoyle and others ...

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