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njay22
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If the Earth orbits the sun how can astronauts fell no attraction to the sun in space. Even pluto which is 4500 million years away, still orbits the sun.
njay22 said:If the Earth orbits the sun how can astronauts fell no attraction to the sun in space. Even pluto which is 4500 million years away, still orbits the sun.
njay22 said:how can it still be powerful enough to attract let's say uranius millions and millions of light years away
D H said:What makes you think it is small? The gravitational force exerted on the Moon by the Sun exceeds the force exerted on the Moon by the Earth.
mathman said:Not so! The best evidence is the fact that the moon's effect on tides is about three times that of the sun.
Its an easy matter to compute the gravitational acceleration of the Moon toward the Sun and Earth:Danger said:Apples and oranges? DH was referring to the gravitational force from the sun, as opposed to from the Earth, upon the moon. You're talking about the difference between the moon's and the sun's effect upon Earth.mathman said:Not so! The best evidence is the fact that the moon's effect on tides is about three times that of the sun.
D H said:… Apples and oranges.
DH gave the answer to the previous issue, but the answer to the tides issue is that the tides are more dependent on distance than the actual force of gravity is because the tidal force is a measure of the difference in gravitational force between the near and far sides of the earth. It's an inverse cube relationship instead of an inverse square relationship.mathman said:Not so! The best evidence is the fact that the moon's effect on tides is about three times that of the sun.
The answer is extremely simple: we can't 'feel' the gravitational force from almost everything, including the Earth. The one exception is a future astronaut who ventures a bit to close to a black hole or neutron star. The difference in the gravitational acceleration between the astronaut's head and feet might literally tear the astronaut apart. With the exception of these extreme tidal forces, we cannot feel gravity, including ...robertm said:Now for why me or your astronaut friend can't 'feel' the gravational force of the sun,
... the earth. We do not feel the gravitational force exerted on us by the Earth. What we feel instead is the upward normal force exerted by the Earth that keeps us from sinking into the Earth. Gravity itself is undetectable (directly). The accelerometers in airplanes, in spacecraft , and in your inner ear measure all forces acting on the plane, the spacecraft , or your head except for gravitational force.We can 'feel' with our various biological senses the effects of the mass of the Earth but not that of the sun.
The Earth's orbit around the sun is the path that the Earth takes as it revolves around the sun. It is an elliptical orbit, meaning that it is shaped like an oval rather than a perfect circle.
The Earth's orbit around the sun takes approximately 365.24 days, or one year, to complete. This is why we have leap years every four years to account for the extra quarter day.
The Earth's orbit around the sun is caused by the gravitational pull of the sun. The sun's massive size and gravitational force keeps the Earth in its orbit.
The Earth's distance from the sun varies during its orbit due to its elliptical shape. This means that at certain points in its orbit, the Earth is closer to the sun (perihelion) and at other points, it is farther away (aphelion).
The Earth's orbit around the sun is responsible for the changing of the seasons. As the Earth revolves around the sun, its tilt causes different parts of the Earth to receive more or less direct sunlight, resulting in the different seasons.