Sentences with phrase «exosphere with»
«The variation of Mercury's calcium exosphere with the planet's position in its orbit has been known for several years from MESSENGER observations, but the proposal that the source of this variation is a meteor shower associated with a specific comet is novel,» added MESSENGER Principal Investigator Sean Solomon, of the Lamont - Doherty Earth Observatory at Columbia University in New York.
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Though that program was never completed, an unverified press report claims that the US is planning a triple - canopy space shield that will stretch from the stratosphere to the exosphere and will be patrolled by drones (Global Hawk and X-37B drones) with missiles.
Earth's exosphere consists mainly of hydrogen with traces of helium, carbon dioxide and atomic oxygen.
Extreme conditions of solar wind, UV flux and surface temperature, in combination with patterns of plasma precipitation to the surface guided by Mercury's magnetic field, result in a dynamic exosphere configuration.
In order for an atom or molecule to escape a planet, two things are required: (1) its speed must exceed the escape speed, which is 5 km / s for Mars and 10 km / s for Earth, and (2) it must be high enough in the atmosphere such that it does not collide with another atom on its way out (this part of the atmosphere is called an exosphere).
The layer above 500 km is referred to as the exosphere, a region in which at least half of the upward - moving molecules do not collide with one another.