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Stars rotating around planets
- Thread starter Cooky
- Start date
Subduction Zone
Veteran Member
Because stars are really really big compared to planets.
Because any system revolves around its center of mass. The mass of a star is large enough compared to any planet that the center of mass is within the star.
Now, there *are* binary star systems where the stars have about the same mass. In that case, they both revolve around a center point between the two stars.
Now, there *are* binary star systems where the stars have about the same mass. In that case, they both revolve around a center point between the two stars.
BSM1
What? Me worry?
If you were a star wouldn't you expect to be orbited as oppose to orbiting? I mean, what's the point otherwise?
Cooky
Veteran Member
Surely there must be one or two super-planets out there knocked out of orbit by colliding galaxies... it seems possible. And if it can happen, it probably will?
Cooky
Veteran Member
There is no planet in space larger or containing more mass than a star?
...I'd like to explore why that is.
Thief
Rogue Theologian
nope
Mainly because something as massive as a star will have so much pressure inside of it that nuclear reactions will start, making it into a star.
Because anything the size of a star will become a star. The immense mass and gravity of celestial objects at that size causes fusion reactions to happen in the core--which, by definition, gives you a star.
Gah, beat me to it.
Thief
Rogue Theologian
you beat me to it...….by a minute
As a comparison. There are eight planets. The Earth is one of the smaller ones. Jupiter is about 300 times as massive as the Earth and the sun is about 1000 times as massive as Jupiter. The mass of the sun is about 99.86% of the total mass of the solar system.
The sun is a smallish star.
The sun is a smallish star.
I'd also point out that there are objects called 'brown dwarfs' that are from about 10 to 80 times as massive as Jupiter. They are 'failed stars' in that they are not quite massive enough for the pressure to start nuclear reactions, but they are not usually classified as planets either.
@Landon Caeli
@Landon Caeli
Thief
Rogue Theologian
how about?......stars that have planets are suns
stars without planets are just stars
Cooky
Veteran Member
That's very interesting. Thanks!