The Science Page

FallenSanity said:
If the earth revolves around the sun, why does the sun move?

Your turn sciences.
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2 reasons

1) the earth's orbit is not perfectly circular (elliptical) and so the distance between the earth and sun changes and thus the relative position of the the sun changes.

2) the gravitational force of the planets act on the sun this causes the sun to 'wobble' think of it this way. if you had a tennis ball attached to a string and you swung the tennis ball round your head it would cause you to wobble, much like hammer throwers at the Olympics.

scientist's look for the wobble of distant stars to determine if there are any planets orbiting it. the bigger the wobble the bigger the planet

Your turn inquisitive human
 
the sun moves because of the gravitational pull of the black hole at the center of the galaxy, for the same reason that the earth moves because of the gravitational pull of the sun. it's like a fractal.
 
ardelenia said:
the sun moves because of the gravitational pull of the black hole at the center of the galaxy, for the same reason that the earth moves because of the gravitational pull of the sun. it's like a fractal.
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The sun dosen't move because of the gravitational pull of the centre of the galaxy. The sun and everything else in the universe moves because it was all expelled from a single point nearly 14 billion years ago. And according to the famous equation F=ma it cannot decelerate unless a force acts on it to decelerate it.
 
So something I learned while studying for laboratory animals.

WARNING: For some this may contain explicit content which can be inappropriate for young minds.

For many experiments, researchers need to breed animals or obtain genetic material. In both cases they need spermcells.
Ever thought about how researchers obtain semen from animals?
Of course it's pretty easy to obtain on larger mammals like horses or bulls, since it's more controllable but for smaller animals, it is not so easy. Several methods are set up with a different one for each animal. With dogs they use "manual manipulation", in rodents it's a sort of operation but for rabbits it is different. You can buy artificial rabbit vagina's which are a sort of plastic tube with a small recipient at the tip. Several companies produce these on an industrial scale stating their product is top of the line. Imagine that, having to explain what your job is.
 
Why do they only make them for Rabbits? Why not for dogs? or Elephants?
 
JordD04 said:
Why do they only make them for Rabbits? Why not for dogs? or Elephants?
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Because it isn't possible to make other animals use them. Collecting semen for breeding of lab animals is pretty difficult because the samples need to be of a high quality. That and why make an expensive scientific correct dog vagina when you can use manual manipulation that is a lot cheaper?
 
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