2006-12-21 09:53:17 · 15 answers · asked by shlomo lhrar 1 in Science & Mathematics ➔ Astronomy & Space
Just by the sake that all objects that have mass also have gravity...they mutually coexist. The more mass an object has, the more gravity it has.
2006-12-21 12:42:00 · answer #1 · answered by Shaula 7 · 3⤊ 0⤋
Short Answer:
A star's mass is created by the condensing of giant interstellar molecular clouds, consisting mostly of hydrogen.
Long Answer:
You question doesn't quite make sense. Gravity is defined by mass. The more mass something has, the more gravity it has.
Maybe you mean how does a star get massive?
A star gets its mass from the accretion of large molecular clouds, light years across, made up of mostly hydrogen gas. These cool interstellar gaseous globules (known as EGGs), become stellar nurseries. The molecular clouds, which permeate our galaxy and other galaxies, condense in spots. Those spots that are more condensed than others have a slightly higher mass, so they have a slightly higher gravity. Therefore, more hydrogen gas is attracted to the denser areas. These dense areas, over hundreds of millions of years, eventually get so dense that at their centers (cores) the temperature goes up, since there is more pressure density. The more the pressure, the higher the temperature. At about 10 million degrees Kelvin, those cores start fusing hydrogen into helium through nuclear fusion, and a star is born.
Many stars are born from just one EGG. The Orion Nebula is a good example of a stellar nursery where thousands of newborn stars were recently discovered by the Hubble Space Telescope. The Pleiades, a star cluster right above Orion, are so new that with a telescope you can still see the blue wisps of the molecular cloud they formed in. By "new" I mean that these stars were born around the time the dinosaurs walked the earth, about 60 million years ago. That is an infant age for a star.
The only thing that keeps the immense gravity of a star from collapsing any further is the outward pressure of the nuclear reactions of the core. Gravity is what drives the nuclear reaction in the first place.
2006-12-21 18:08:27 · answer #2 · answered by Anonymous · 1⤊ 0⤋
A star has a property known as mass. All mass "creates" gravity. How this happens is not known because science has yet to totally understand why mass has the properties it does.
2006-12-21 17:55:40 · answer #3 · answered by Chug-a-Lug 7 · 3⤊ 0⤋
The force of gravity is a direct correlation of mass. All objects have a gravitational force commensurate and in proportion to their total mass - which is why we don't float off the Earth and can type on our computer keyboards, etc.
A star, even a relatively small star like our sun, has such significant mass that its gravitational force enables it to hold enormous objects in orbit like planets.
Best to you.
2006-12-21 17:56:44 · answer #4 · answered by Timothy W 5 · 3⤊ 0⤋
Anything with mass will have a gravitational force, regardless of size. A marble will orbit a bowling ball in otherwise empty space.
2006-12-21 17:57:07 · answer #5 · answered by Mickey Mouse Spears 7 · 3⤊ 0⤋
everything with mass has its own gravitational force. since stars are so massive, they have more gravity.
2006-12-21 17:56:01 · answer #6 · answered by Mastronaut 3 · 4⤊ 0⤋
Depends on how much they're willing to spend on publicity I suppose. Directors help a lot too!
2006-12-21 17:55:30 · answer #7 · answered by vanamont7 7 · 2⤊ 1⤋
It's a inner Chemical energy thing!,,Hydro-it !
2006-12-21 18:35:52 · answer #8 · answered by Anonymous · 0⤊ 2⤋
In Oprah's case, by eating too much and not exercising enough.
2006-12-21 17:55:15 · answer #9 · answered by Anonymous · 0⤊ 2⤋
In order for something to have it's own gravitational force, it has to reach a certain size
That's why the Sun's is so powerful- because it is so large
2006-12-21 17:54:54 · answer #10 · answered by rcsmith525 2 · 0⤊ 6⤋