        The Known Planets..

Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune

Pluto


Mercury

Mercury is the inner-most planet in the solar system.

It has a sidereal period of 88 earth-days.


Sidereal: The term sidereal pertains to the stars; hence a sidereal period is the amount of time it takes a planet to go around our star, the sun.


Venus

 Venus is second from the sun, and has a nearly

 circular orbit.  Venus exhibits considerable

 volcanic and seismic activity.


Earth

 Earth is third from the sun, and is the only

 planet in the solar system known to support life.


Mars

 Mars is the fourth planet from the sun, and

 appears to have had water at one time.  There

 is much carbon dioxide on Mars, which could

 someday support plant life.  Mars also has two moons.

 See also:

 Phobos

 Deimos


Phobos

Phobos is one of two Martian moons.  It completes

an orbit around Mars in 7 hours and 39 minutes.


Deimos

Deimos is one of two Martian moons.  It completes an orbit around Mars

in 1 day, 6 hours and 21 minutes.