From educlick
The Late Heavy Bombardment (LHB), or lunar cataclysm, is a hypothesized event thought to have occurred approximately 4.1 to 3.8 billion years (Ga) ago, at a time corresponding to the Neohadean and Eoarchean eras on Earth.
Continue reading “THE LATE HEAVY BOMBARDMENT”Rockets that is launched have a at least 7.6 kilometre per second (4.9 miles per second in order to reach space, Or more than 20 times the speed of sound is necessary to get into space.
The obvious reason is the capacity of rocket. Since we use conventional chemical propulsion system , even in space we relies on solar power & chemical power for our spacecrafts. Thus it requires huge amount of fuel to go directly to moon against the gravity of earth and of course sun. But in orbital motion , we are assisted by the same gravity to boost our craft speed to such level to be able to the moon.
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