ChatterBank1 min ago
Why hasn't the earth crashed in to the sun yet?
14 Answers
If we drop a ball out of a plane it reaches its terminal velocity and then accelerates no more. This is due to resistance from air. In space there is no air to offer resistance to the path of the earth so why hasn't the gravity pull of the sun caused the earth to be continually accelerating towards it at phenomenal speeds and already crashed into it by now?
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According to Einstein's theory, any mass warps space around it. Imagine a heavy lead ball placed on a thin sheet, the surface of the sheet will sagl and the ball will sink into the depression. The ball represents the mass, and the bed represents space.
Therefore, the planets, relative to themselves, are actually following a straight line. But since the sun warps space around it, the planets appear to follow a circular path around the sun.
Therefore, the planets, relative to themselves, are actually following a straight line. But since the sun warps space around it, the planets appear to follow a circular path around the sun.
Anyways, according to Newtonian physics
This happens because the Earth has a velocity in the direction perpendicular to the force of the Sun's pull. If the Sun weren't there, the Earth would travel in a straight line. But the gravity of the Sun alters its course, causing it to travel around the Sun.
The earth continues falls towards the sun at every point in its orbit but never hits it thus following an elliptical orbit with the sun at its focii.
This happens because the Earth has a velocity in the direction perpendicular to the force of the Sun's pull. If the Sun weren't there, the Earth would travel in a straight line. But the gravity of the Sun alters its course, causing it to travel around the Sun.
The earth continues falls towards the sun at every point in its orbit but never hits it thus following an elliptical orbit with the sun at its focii.
Earth falls towards the Sun annually but as it falls it gains velocity by the conservation of angular momentum (the figure skater spinning faster as they pull their combined mass inward). The velocity gained in falling towards the Sun increases the Earth's orbital velocity which then forces it further away from the Sun slowing its orbital velocity again allowing gravity to pull it back. These mutual changes in distance and velocity are sufficiently balanced to produce a stable orbit of the Earth around the Sun.
The Sun over time is losing mass through radiation and this has actually increased the distance at which the Earth orbits the Sun (slightly).
The Sun over time is losing mass through radiation and this has actually increased the distance at which the Earth orbits the Sun (slightly).
Marg0, welcome to answerbank
angular momentum is always conserved
The skater was presented as an example to relate the conservation of angular momentum to common experience.
click on links for more and possibly better explanations
angular momentum is always conserved
The skater was presented as an example to relate the conservation of angular momentum to common experience.
click on links for more and possibly better explanations
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