Sun & Moon
History
of the Sun
(TFS) - The Sun is by far the largest object in the
solar system. It contains more than 99.8% of the total mass of the Solar System
(Jupiter contains most of the rest).
It is often said that the Sun is an
"ordinary" star. That's true in the sense that there are many others
similar to it. But there are many more smaller stars than larger ones; the Sun
is in the top 10% by mass. The median size of stars in our galaxy is probably
less than half the mass of the Sun.
The Sun is personified in many mythologies: the Greeks called it Helios and the Romans called it Sol.
The Sun is personified in many mythologies: the Greeks called it Helios and the Romans called it Sol.
History
of the Moon
Called Luna by the Romans, Selene and Artemis by the
Greeks, and many other names in other mythologies.
The Moon, of course, has been known since prehistoric
times. It is the second brightest object in the sky after the Sun. As the Moon
orbits around the Earth once per month, the angle between the Earth, the Moon
and the Sun changes; we see this as the cycle of the Moon's phases. The time
between successive new moons is 29.5 days (709 hours), slightly different from
the Moon's orbital period (measured against the stars) since the Earth moves a
significant distance in its orbit around the Sun in that time.
The Moon was first visited by the Soviet spacecraft
Luna 2 in 1959. It is the only extraterrestrial body to have been visited by
humans. The first landing was on July 20, 1969 (do you remember where you
were?); the last was in December 1972. The Moon is also the only body from
which samples have been returned to Earth. In the summer of 1994, the Moon was
very extensively mapped by the little spacecraft Clementine and again in 1999
by Lunar Prospector.
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source: http://nineplanets.org/sol.html http://nineplanets.org/luna.html