The results, which provide new evidence about the origin of the lunar exosphere
, are consistent with the idea that solar photon-driven processes dominate in supplying exosphere
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.
project is an open hardware space shuttle design.
Answers (based on the chart above): 18 km; 32 km; 35 km; 415 km; 9,100 km; troposphere; exosphere
The distribution of individual chemical elements that the spacecraft saw in Mercury's exosphere
varied around the planet.
To distinguish among these processes, spectrometers on the craft will compare the composition of the exosphere
with that of surface rocks.
is a massive 600kg colt, way above the average for most fully-grown thoroughbreds which is about 500kg.
Sputtering is among the top five processes that create the moon's exosphere
under normal solar conditions, but our model predicts that during a CME, it becomes the dominant method by far, with up to 50 times the yield of the other methods," said Killen.
In science, which is the higher part of the atmosphere: the exosphere
or the stratosphere?
Measurements of the exosphere
led to the first detection of magnesium, and recognition of the fact that the spatial distributions of magnesium, calcium, hydrogen and sodium are all different from each other.
But the ISS orbits 402 km (250 mi) above Earth in the exosphere
Then there is the notion of accelerating oxygen and hydrogen from the outermost reaches of the atmosphere, or exosphere
, downward into the nightside by means of magnetic and electric fields from the solar wind.