Objects closer to Earth than the L1 point are controlled by Earth's gravity. Objects beyond the L1 point are controlled by the Sun. When J002E3 came close to the L1 point in April 2002, the object passed throuhgh L1--like a portal--from a Sun-orbit to an Earth-orbit.
In the top 20km of the Earth's crust, the conditions are right to produce a nearly inexhaustible supply of hydrogen, said Prof Freund. Studies by the team of common rock types such as granite and olivine have revealed extraordinarily high levels of trapped hydrogen.
Hydrogen is easily the most abundant element in the universe. It is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen. On Earth, hydrogen is found in the greatest quantities as water.It is present as a gas in the atmosphere only in tiny amounts â less than 1 part per million by volume. Any hydrogen that does enter the atmosphere quickly escapes the Earthâs gravity into outer space.n Earth, hydrogen is found in the greatest quantities as water. It is present as a gas in the atmosphere only in tiny amounts â less than 1 part per million by volume. Any hydrogen that does enter the atmosphere quickly escapes the Earthâs gravity into outer space.