The Solar System

The major reason is that we have the only known planet with life on it, but it is also special to us because it contains our home planet. (In the same way a home town would be special to the person who came from it.)

Mercury has a surface pressure that is near enough zero (or a vacuum), the planet holds no real atmosphere due to its small size. There are some trace gases at the surface, but not what one would call a proper atmosphere.

Yes, it is a nonliving factor that has connections to many of the species, so it is part of the ecosystem.

The sun has the most gravity in the solar system because it has the most mass. Mass has the ability to warp the space around it; the space is bowed out away from the mass and wants to spring back towards the mass. The potential of space pushing back towards the mass creates a force towards the mass. Therefor gravitational pull is more acurately space pushing in toward the mass.

The two planets are almost totally dissimilar, except that the lowest cloud levels of Uranus are thought to contain water vapor, as clouds do on Earth. But Uranus has no solid surface for rain to fall on, and is the coldest major planet in the solar system.

Mercury. Whilst it is not the most dense (Earth being the most dense planet of the Solar System), without gravitation compression on the Earth, Mercury would be the most dense.

So if Earth was the same size as Mercury, Mercury would be the densest planet.

It is also the smallest planet.

They are all different sizes.

The inner planets. Only Venus and Earth have active volcanoes (volcanoes that are erupting). Mercury and Mars have extinct (dead) volcanoes. Olympus Mons, the largest mountain/volcano in the Solar System, is found on Mars.

Io, one of Jupiter's moons, is the most volcanically active body in the solar system. The reason for this is tidal heating which is created by the gravitational pull of Jupiter and the other three Galilean moons.

Please note that "fastest" can be interpreted two ways: the actual speed a planet is traveling around the sun, or the actual time required for a given planet to complete it's orbit around the sun. In the first case, the larger a planet is, the greater it's mass and therefore the higher it's speed. One of the gas giants like Jupiter or Saturn being hundreds of times times larger than the inner planets like earth is traveling at immense speed. In the second case, the closer a planet is to the sun the shorter it's orbit will be and generally the faster it's trip will be. The planet closest to the sun and having the shortest obit around it is Mercury.

Here are a couple of the ways. Astronomers look for wobbles in the movements of stars. This may indicate that a large planet is in orbit around it. They also look for small regular variations in the brightness of stars, possibly indicating that a planet passes over the face of the star that we see, slightly reducing the amount of light we get from the star.

We're currently only aware of one planet that supports any life. That planet is Earth, the one you're presumably on right now. Since this is the only planet with life, it has both the longest and the shortest life span. Life span varies depending on what organism you're talking about. The human life span -- the longest a human is confirmed to have lived -- is approximately 122 years old. Life span is different than life expectancy. Life expectancy is the average length of a human life, and it varies widely based on factors such as geography, poverty, gender, race, etc.

If you went to any other planet in our solar system without proper protective equipment (spacesuit, etc.), your life expectancy would be exceedingly small.

The planets that are farther from the Sun than Earth are (in this order): * Mars

* Jupiter

* Saturn

* Uranus

* Neptune and sometimes Y, er, I mean the Dwarf Planet Pluto. (It's 'sometimes' because Pluto's orbit brings it closer to the Sun than Neptune part of the time [most recently for 20 years ending in 1999] which is one of the reasons why it was reclassified as a Dwarf Planet.)

Mass of Planet X divided by volume of Planet X

The smallest objects in quantum physics are "strings" which are 10^-35m in size which is comparable to the Plank length. At this size nothing is flat, measureable or quantifiable. Nothing can be measured smaller than this by any technique currently in use OR will ever be invented in the future... unless a new form of maths and physics is invented which alters our current perception of the very small...

well we use three main ones : Light years, parsecs and kilometers, but we usually only use kilometers for our inner solar system

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There is also the Astronomical Unit, AU, which is the average distance between the earth and the sun. A parsec is roughly 3.3 light years, and a light year is the distance covered by light in a vacuum in one earth year.

um also the distance requires the sun. Since astronomers did not know where to start, they measured everything in the universe starting with the sun.

The force that keeps asteroids moving through space is inertia. The law of inertia is that a body remains in its state of rest or uniformed motion unless acted upon by a force.

Malleable.

See Web Links for a definition.

Ductile is a similar word. Both are commonly applied to describe metals.

It's 4.37 light years to Alpha Centauri.

earth's shape is influenced by gravity because gravity will pull the objects in space together forming a sphere

Saturn's year lasts 29.5 Earth years, however Saturn's day lasts only 10.6 Earth Hours. That is less than half of one Earth day.

Most of the planets in our solar system are named after both roman and greek gods. For example: Neptune is the name of the greek god of the sea, Venus is the name of the roman god of loveand so on. (For future referance) Pluto is no longer a planet or dwarf planet, it is now refferred to as a plutoid. Also, the planets of the Solar system are named after the Ancient Greek Gods and Goddesses: Hermes/ Mercury, Aphrodite/ Venus, Ares/ Mars, Zeus/ Jupiter, Kronos/ Saturn, Uranus, Posidon/ Neptune and Hades/ Pluto in order of their orbit. The first God and Goddess were Uranus and Gaia. Kronos and Rhea were their successors. Zeus son of Kronos and Rhea was the leading God of the Ancient times along with his family memebrs (brothers, sisters, sons and daughters).

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