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My recent visit to Zimbabwe

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 The journey was well planned and it took us less than 10 hours to reach our destination from Pretoria South Africa to Mvuma central Zimbabwe.  A lot of construction is happening on the roads. Harare to Masvingo Highway is complete and the remaining part which was left between Beitbridge and Masvingo is being completed.  Surely by December it should be done. Though there is a lot of money being miss used, there are elements of success. Harare to Beitbridge road was a death trap, the road had so many potholes, had no shoulder no fencing to protect  animals from entering the road and some parts even worn out that left it narrow in a way that two trucks cannot pass without one having to go out of the road.  Those improvements form part of the new Government's transformation policy. There is job creation and slowly improving the standards which has been declining for more that 20 to 30 years. Surely Rome was not built over night. At the border you can see significan...
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UNIVERSE TODAY Space and astronomy news

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POSTED ON BY NANCY ATKINSON

Fantastic Visualization Shows What Would Happen if you Dropped a Ball Across the Solar System

Summertime means it’s time to play ball! But what would it be like to play ball on various locations across our Solar System? Planetary scientist Dr. James O’Donoghue has put together a fun animation of how quickly an object falls on to the surfaces of places like the Sun, Earth, Ceres, Jupiter, the Moon, and Pluto.

The animation shows a ball dropping from 1 kilometer to the surface of each object, assuming no air resistance. You can compare, for example, that it takes 2.7 seconds for a ball to drop that distance on the Sun, while it takes 14.3 seconds Earth.  

“This should give an idea for the pull you would feel on each object,” O’Donoghue said.

But what about the pull of gravity on the big planets vs. Earth? Interestingly enough, it takes and 13.8 seconds for the ball to drop on Saturn, and 15 seconds on Uranus.

“It might be surprising to see large planets have a pull comparable to smaller ones at the surface,” O’Donoghue said on Twitter. “For example Uranus pulls the ball down slower than at Earth! Why? Because the low average density of Uranus puts the surface far away from the majority of the mass. Similarly, Mars is nearly twice the mass of Mercury, but you can see the surface gravity is actually the same… this indicates that Mercury is much denser than Mars.”

Ceres comes in at the pokiest place to play ball, with a ball dropping 1km in 84.3 seconds.

O’Donoghue, along with input from astronomer Rami Mandow, used a NASA planetary fact sheet for reference to create the video.

O’Donoghue also referenced one of the most famous gravity experiments ever conducted, the one by astronaut Dave Scott on the Moon:

O’Donoghue has a number of great videos on his YouTube channel, including a visualization of the velocities required to escape the pull of gravity from various bodies in the Solar System.

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