Second cosmic velocity refers to the speed needed to get rid of ravitational field without further propulsion. The second cosmic velocity is also known as the Escape velocity. Different from the first cosmic velocity, objects that are flying at second cosmic velocity can get away from Earth instead of doing circular motion around the Earth. But still the second cosmic velocity is still not enough to get rid of the gravitational fileld of the Sun, which means it is impossible to get out of the solar system without making the speed even higher and reach the third cosmic velocity.
The second cosmic velocity equals 11.2 km /s.
There is something to clarify. Even the NASA space shuttle doesn't reach this speed. For Endeavour, OV-105, the speed is 7,743 m/s (27,870 km/h; 17,320 mph) according to NASA.
- Subject : Science
- Topic : Physics
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