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An object with mass has a quality called inertia.

Time on Venus

If you shake an object like a stone in your hand, you would notice that it takes a push to get it moving, and another push to stop it again. If the stone is at rest, it wants to remain at rest. Once you've got it moving, it wants to stay moving. This quality or "sluggishness" of matter is its inertia. Mass is a measure of how much inertia an object displays.

Weight is an entirely different thing.

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Every object in the universe with mass attracts every other object with mass. The amount of attraction depends on the size of the masses and how far apart they are. For everyday-sized objects, this gravitational pull is vanishingly small, but the pull between a very large object, like the Earth, and another object, like you, can be easily measured.

All you have to do is stand on a scale! Scales measure the force of attraction between you and the Earth. This force of attraction between you and the Earth or any other planet is called your weight. If you are in a spaceship far between the stars and you put a scale underneath you, the scale would read zero.

VENUS & MERCURY - A Traveler's Guide to the Planets - Full Documentary

Your weight is zero. You are weightless. There is an anvil floating next to you. It's also weightless. Are you or the anvil mass-less? Absolutely not.

If you grabbed the anvil and tried to shake it, you would have to push it to get it going and pull it to get it to stop. It still has inertia, and hence mass, yet it has no weight. See the difference? As stated above, your weight is a measure of the pull of gravity between you and the body you are standing on.

Your Age on Other Worlds | Exploratorium

This force of gravity depends on a few things. First, it depends on your mass and the mass of the planet you are standing on.

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  • If you double your mass, gravity pulls on you twice as hard. If the planet you are standing on is twice as massive, gravity also pulls on you twice as hard. On the other hand, the farther you are from the center of the planet, the weaker the pull between the planet and your body.

    Public Outreach. Venus, the planet. Venus, sister of Earth? Venus Research. Venus Transit. Venus is a prime target for space missions and the first were sent by both the Soviets and the Americans at the start of the 60s: in fact, Venus is twice as close to Earth as Mars is and celestial mechanics calculations are easier for a planet without a moon.

    Planet Venus Facts: A Hot, Hellish & Volcanic Planet

    Since the dawn of the space age, a total of 23 missions American and Soviet have successfully travelled to Venus, out of 41 that were launched counting all of those that flew past Venus without being dedicated to studying it. This success rate is much higher than that of Mars missions. It also discovered the slow retrograde rotation of Venus. During the following three years the Soviets sent lots of missions, including the first Venera probes but most were lost.

    However, in the descent module of Venera 4 retransmitted the first data on the lower levels of the atmosphere between 55 and 25km confirming its dominant CO 2 composition and its density. After 2 further attempts, the Soviets finally landed Venera 7 on the surface in , using a parachute. This was the first automated vehicle that man placed on another planet.

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    The exploration of Venus seemed to be like that of the deepest ocean trenches, with heat and toxic gases added. In the American Mariner 10 probe took the first remote images in ultraviolet and studied the strange movements of the atmosphere, revealing the fast rotation of the same super-rotation. One year later, the Soviets achieved another great accomplishment with black and white photos of the surface, sent by the lander of the probes Venera 9 and 10 , huge machines that survived about 1 hour in the intense oven that is Venus.

    The data taken over several years demonstrated the major role of constituents like SO 2 in the atmospheric chemistry of the atmosphere and the formation of clouds of sulphuric acid H 2 SO 4 in the upper atmosphere.