Gravity

Io is a moon of Jupiter, not a planet. Surface gravity is about 18% of the gravity on Earth.

Yes, gravity pulls a spacecraft towards the nearest planet because objects with mass attract each other. The gravitational force between the spacecraft and the planet causes the spacecraft to be pulled towards the planet as it travels through space.

They feel weightless because they are indeed weightless when in orbit, in effect in freefall. Gravity tries to pull them down but the spacecraft motion carries it "past the planet" in an arc that is part of a circular or elliptical orbit. If the spacecraft slows down, it will be pulled toward the Earth by the considerable gravitational force.

If an astronaut tries to use an ordinary scale to measure her weight, all attempts will be useless. The vessel she is in is under the influence of Earth's gravity, it is true, as is her body. But the vessel and her body are in the same orbit, at the same velocity. If she is motionless at the center of the vessel, no unbalanced forces will push her "down" toward the floor or hull of the vessel. And if there are some unbalanced forces, they are so small as to be negligible for all practical purposes. She will not be able to 'step' onto a scale, unless she is in some kind of rotating vessel, which would provide a kind of artificial gravity.

A tablecloth.

Gravity is the force that holds the Sun together, causing it to contract and generate the high pressure and temperature at its core that sustains nuclear fusion reactions. The Sun's massive gravity also keeps the planets in orbit around it, maintaining the stability of our solar system.

Yes, in free fall, the distance the object travels increases at a rate proportional to the square of the time elapsed, as described by the equation d = 1/2 * g * t^2, where d is the distance fallen, g is the acceleration due to gravity, and t is the time.

The story of the apple falling on Isaac Newton's head is a popularized version of the events that led him to develop his theory of gravity. Newton's law of universal gravitation describes the attraction between objects with mass, like the apple and Earth, and explains how the moon stays in orbit around Earth.

The moon's gravity is about 1/6th (16.5%) as strong as Earth's gravity. This means that an object on the moon weighs about 1/6th of what it weighs on Earth.

Jupiter has enough gravity to hold on to most gases because it is the largest planet in our solar system. Its strong gravitational pull prevents gases from escaping into space, allowing it to maintain its thick atmosphere.

Isaac Newton is credited with defining gravity in his work "Philosophiæ Naturalis Principia Mathematica" published in 1687. Newton's law of universal gravitation states that every mass attracts every other mass in the universe with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.

333,000 times more than the mass of the Earth

Yes. The force of attraction between two objects is inversely proportional to the square of separation between the objects. That's why if we move away from the Earth (or any stellar object), the pull of gravity gets weaker.

You could also say that the farther you are from another mass, the smaller your *mutual* attraction by gravity, since all objects attract all other objects. It is only in asteroids, moons, planets, and stars that we begin to see it as an appreciable force.

The speed of a rocket on takeoff from Earth varies depending on the rocket design and mission requirements. Typically, rockets reach speeds of around 17,500 mph (28,000 km/h) in order to overcome Earth's gravitational pull and enter orbit.

Gravity differs on different planets because it is determined by the mass of the planet. The larger the mass, the stronger the gravitational pull. Each planet has a unique mass and size, resulting in different levels of gravity on each planet.

Pluto is the weakest force of the Sun's gravity because it is the farthest planet from the Sun in our solar system. The strength of gravity weakens with distance, so objects located farther away experience weaker gravitational attraction. This is why Pluto's orbit is more influenced by the gravity of other celestial bodies, such as Neptune, than by the Sun itself.

Gravity was not "made up" by any individual, but was rather observed and described by numerous scientists throughout history. Sir Isaac Newton is known for his law of universal gravitation, which explains the force of gravity between all objects with mass.

There is no minimum mass at which point an object (celestial or otherwise) begins to have a gravitational force. Any object with mass has an associated gravitational force. The magnitude of that force is proportional to to the mass of the object - lots of mass results in lots of gravitational force; little masses result in only little gravitational force.

Gravity pulls the satellites but the orbiting satellites don't fall down towards earth because the speed with which they move balances the gravitational force i.e. Centripetal force = Gravitational force.

The percentage of Earth's gravity on the surface of the Moon is about 16.5%.

Gravity acts to pull matter inward, causing a star to contract and increase density. Fusion, on the other hand, generates energy by fusing hydrogen nuclei to form helium, resulting in outward pressure that counteracts gravity and maintains the star's stability.

The gravitational forces of attraction between you and a meteor are exactly the same

as the gravitational forces of ttraction between you and any other object that has the

same amount of mass as the meteor has, and is the same distance from you.

Albinos may have weaker eyesight because of the lack of pigment in their eyes, which can lead to increased sensitivity to light or decreased visual acuity. Additionally, albinos may have a higher risk of skin cancer due to reduced protection from ultraviolet radiation from the sun.

The gravity on Ganymede, which is one of Jupiter's moons, is about 0.146 times that of Earth's gravity. This means that if you weighed 100 pounds on Earth, you would weigh about 14.6 pounds on Ganymede.

The gravity on the Moon is about 1/6th of the gravity on Earth. This means that an object on the Moon would weigh only about 16.5% of its weight on Earth.