The Planets: neighbors in space
All of the planets Vary in size. Jupiter being the largest and pluto being the smallest.
Earth ranks 5th in size among the other planets. All of the planets besides Mercury, and Venus have moons, smaller spheres or satellites orbit them.
The largest planet, its diameter:
The fifth largest planet, its diameter:
The smallest planet, its diameter:
Comets, Asteroids, and Meteoroids
Asteroids are small, funny looking irregular shaped, planet like objects. they are usually found between the orbits of Mars and Jupiter in a region called the asteroid belt.
Comets, which are made of icy particles of dust and frozen gases, look like bright orbs with long, feathery tails.
Meteoroids are pieces of space debris, chunks of iron and rock. when they sometimes enter our atmosphere, friction most of the time usually burns them up before reaching earths surface.
Water, Land, and Air
Abut 30% of Earths surface is land, including continents and islands. Land makes up an area of the earth called the lithosphere.
The oxygen we breathe is a part of the earths atmosphere, a layer of all kinds of gasses that span about 6,000 miles above the earths surface. Our atmosphere is composed of 78% Nitrogen, 21% oxygen small amounts of argon and other gases.