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The velocity corresponding to the circular orbit is sometimes called the first cosmic velocity, whereas in this context the escape velocity is referred to as the second cosmic velocity. [ 12 ] [ 13 ] [ 14 ]
This speed was slightly less than the Earth's escape velocity of 36,747 feet per second (11,200 m/s), but put Apollo 8 into an elongated elliptical Earth orbit, close enough to the Moon to be captured by the Moon's gravity. [50]
The Moon's mass is 1 ⁄ 81 of Earth's, [72] being the second densest among the planetary moons, and having the second highest surface gravity, after Io, at 0.1654 g and an escape velocity of 2.38 km/s (8 600 km/h; 5 300 mph).
Even if the pilot made a few errors on the way to space, that was not necessarily fatal. The CSM had a fuel reserve, and plans would allow it to change velocity by a maximum of around 250 meters per second in order to rendezvous with the LESS after orbit insertion.
Tidal rhythmites from 620 million years ago show that, over hundreds of millions of years, the Moon receded at an average rate of 22 mm (0.87 in) per year (2200 km or 0.56% or the Earth-moon distance per hundred million years) and the day lengthened at an average rate of 12 microseconds per year (or 20 minutes per hundred million years), both ...
This may not be the last time we encounter this space rock
Size comparison of Europa (lower left) with the Moon (top left) and Earth (right) Europa is slightly smaller than the Earth's moon. At just over 3,100 kilometres (1,900 mi) in diameter, it is the sixth-largest moon and fifteenth-largest object in the Solar System.
"The narrow-angle camera will be able to take pictures at a resolution as high as half a meter per pixel. That's about 1.6 feet. And so it will be able to see car-sized objects on the surface of ...