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Planetary scientist Dr James O’Donoghue has made a fun video that compares the speed at which a bullet falls on 12 different surfaces in our solar system. For example, dropping a ball from a height of 0.6 mile and assuming there is no air resistance, it would only take 2.7 seconds to land on the Sun, 14, 3 seconds to land on Earth, 15 seconds for Uranus and 84.3 seconds for Ceres (a fine speed for us less agile athletes).
“This should give an idea of the pull you would feel on each object,” says O’Donoghue on his YouTube page.
From today’s universe:
But what about the pull of gravity on the large planets compared to Earth? Interestingly enough, it takes 13.8 seconds for the bullet to land on Saturn and 15 seconds on Uranus.
“It may be surprising to see the large planets have a comparable attraction to the smaller ones on the surface”, O’Donoghue said on Twitter. “For example, Uranus shoots the ball slower than on Earth! Why? Because the low average density of Uranus moves the surface away from the majority of the mass. Likewise, Mars is almost double the mass of Mercury, but you can see the surface gravity is actually the same… this indicates that Mercury is much denser than Mars. ”…
O’Donoghue, with contributions from astronomer Rami Mandow, used a NASA planetary fact sheet as a reference to create the video.
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