Three Astronomy questions?

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Ra-Mona P

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1.) Why is a comet visible at regular intervals throughout its lifetime?
2.) What color are the largest stars?
3.) What is expected to happen to the Sun in its old age?
 
1. My best bet would be because it reflects the sun's light (Like the moon) we just can't see the moon because of the rotation of the earth.)
2. It doesn't matter the size...it depends on distance. I do know that blue stars are the farthest, and the hottest.
3. I believe the Sun will turn into a red giant, then become a black dwarf, if that is not correct, then it will become a super nova.
 
"...1.) Why is a comet visible at regular intervals throughout its lifetime?..."
It becomes visible when the people living on it turn on the lights.

"...2.) What color are the largest stars?..."
Yes they are.

"...3.) What is expected to happen to the Sun in its old age?..."
It will retire, move to Florida, and go into a nice home for the elderly.
 
Because of the extreme eccentricity of it's orbit. Eccentricity is the measure of how elliptical the orbit is. If an object has a nearly perfect circular orbit, it therefore has low eccentricity.

The largest stars are bright blue, and some white. This graph shows how star temperature and color are related: http://docs.kde.org/development/en/kdeedu/kstars/color_indices.png

Towards the end of the sun's life, it is expected to go "slowly". Once all of the available hydrogen has already been fused, it will create a planetary nebula, and grow to a red giant, and then it will extend it's diameter almost reaching Jupiter. But that won't happen for a few billion years.
 
1. Comets are visible at regular intervals because they orbit around the sun, like Earth. As they get closer to the sun, their ice layers begin to melt off, leaving a tail behind it.
2.The largest stars are usually red hypergiants. VY Canis Majoris is the largest star ever seen. It is a red hypergiant, approx. 1-2000 times the diameter of the Sun.
3. When the sun is about ten billion years, it will begin to burn helium, causing it to expand into a red giant, engulfing Mercury, Venus, and maybe Earth. It will burn its helium for about two billion years before beginning to puff off its outer shell, leaving behind a small, dense white dwarf.
 
1) Because its speed is the same, and its rotation around the sun is the same, so you can see sunlight being reflected of it at regular intervals.
2)They are red because they grow that size when they are really old and out of fuel, thus less hotter and less bluer.
3) It is expected to turn into a giant and almost engulf Earth, and then explode in a nova.
 
1) A comet become visible when it approaches the Sun: sunlight reflects on the icy surface and gas and dust escapes and forms the tail.

2) The largest mains sequence stars are blue. But super giants can be any colour.

3) Wait another 6 billion years and the Sun will run out of hydrogen to burn. It will slowly expand to a Red Giant, before helium fusion kicks in. After a short stage as a Yellow subgiant, it will run out of helium as well. After a second Giant stage in which it will loose almost half of its mass it will finally become a White Dwarf.
 
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