Space. By Brittany. Venus.
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An asteroid is a large rock in outer space. Some, like Ceres, can be very large, while others are as small as a grain of sand. Due to their smaller size, asteroids do not have enough gravity to pull themselves into the shape of a ball. Astronomers group asteroids into different categories based on the way they reflect sunlight.
Meteors or meteorites are bits of rock (like granite) and ice - usually a mixture of rock and iron and nickel but sometimes just rock or just iron - from out in space that get sucked into the gravity of the Earth and fall through our atmosphere to the ground
A comet is a small world which scientists sometimes call a planetesimal (tiny planet). They are made out of dust and
ice, kind of like a dirty snow ball.
A star is a huge sphere of very hot, glowing gas. Stars produce their own
light and energy by a process called nuclear fusion. Fusion happens when lighter elements are forced to become heavier elements. When this happens, a huge amount of energy is created causing the star to heat up and shine. Stars which are smaller than our Sun are reddish and larger stars are blue.
The sun is a star. It is a huge, spinning, glowing sphere of hot gas. The sun is just like the stars that you see in the night sky. It appears so much larger and brighter than the other stars because we are so close to it. The sun is the centre of our solar system. All of the planets in our solar system, including Earth, orbit around the sun.
Galaxies are huge collections of stars, dust and gas. There are hundreds of billions of galaxies in the universe. Galaxies come in many different sizes, shapes and brightness's like stars, they are found alone, in pairs, or in larger groups called clusters. Galaxies are divided into three basic types: spirals, elliptical and irregulars.