ciencias

The earth and the universe
The universe: all the bodies sky between the spaces them form the universe. The universe is very old. It began 15 bition years ago after a large explosion distances are huge in the universe.
For example:
The light emitted by the star nearest our solar system takes for years to reach our planet.
Celestial bodies:
There are many different bodies in the sky. These incluse stars, light the sun, planet, light, earth, and satellites, light the moon they are old called celestial bodies. They are two types of celestial bodies. Stars all luminous celestial bodies this means.
-they emit their own light
-they look likes small pants of lights.
-they are infact very big. Stars are different colors:
The hottest are blue and coolest are yellow and red.
*nonluminous celestial bodies
Planets, satellites, and comets are nonluminous celestial bodies this means they to not emit their own light.
-planets: orbit start
-satellites: orbit planets
-the Lune: is the earth’s only satellite
-comets: comets are small celestial bodies that orbit the sun. They do not emit their own light. They are made of ice and dust; these materials became luminous in the atmosphere and form a long tail. Comets are visible from earth periodically.For example: the hale Bopp comet can be seen every to thousand 2,364 years.ConstellationsWhen we look up at the stars from earth, they are appear to be in groups of stars are cold constellations.GalaxiesCelestial bodies are not isolated. They form groups’ cold galaxies. There are many millions of galaxies in the universe. Each galaxy is made up of millions of celestial bodies. Earth is in the Milky Way galaxy. Galaxies have different shapes.