Astronomy project.

1. By Alyssa Jones
Period 6

2.  The universe is the home to all the galaxies,
stars, planets, matter, energy, and other objects.
 The universe is usually
defined as the totality
of existence.
 Observations show that
the universe is expanding
at a accelerating rate.

3.  Spiral galaxies are made out of dust and bright
stars.
 Elliptical galaxies are round. Some are small,
and some are big.
 Irregular galaxies have many different shapes.
 The milky way galaxy contains around one
trillion stars. It belongs to a group which
contains about thirty galaxies.

4.  Asteroids are small bodies
that never grew large
enough to be a planet.
 Meteoroids are a piece
of debris in the solar
system. When it reaches
the Earth’s
atmosphere it becomes a meteor.
 Meteorites is when a meteoroid survives the
impact after reaching the ground.

5.  Mercury and Venus both have no moons.
 Mercury is the closest planet
to the sun.
 There are many craters on
Mercury.
 Venus is known as Earth’s
twin.
 Venus has very high
pressure and temperature.

6.  Mars has two moons, named Phobos, and
Deimos.
 Mars is called the red planet because iron oxide
gives the weathered rocks a reddish color.
 Earth has one moon, named Luna.
 Earth formed about 4.54 billion years ago.
 It takes Earth 365 Earth days to orbit the sun.
 On Earth water can be a solid, liquid, or a gas.

7.  Jupiter has sixty-three moons, the main ones
are Io, Europa, Ganymede, and Callisto.
 Jupiter is the largest planet. It also has active
volcanoes on its surface.
 Saturn has a total of sixty-one moons, the main
two are Titan, and Rhea.
 Saturn has a very complex ring system.
 The second largest planet is Saturn.

8.  Uranus has twenty-seven moons, two are
Cordelia, and Ophelia.
 Uranus has thin dark rings.
 It’s axis of rotation is tilted.
 Neptune has thirteen moons, one is named
Triton.
 Neptune's rings vary in sizes, and thickness.
 Sometimes its farther from the sun then, the
dwarf planet, Pluto.

9.  The solar system only has eight planets, but
also has four dwarf planets.
 The solar system goes out as far as about 2 light
years.
 Everything in the solar system orbits in the
same direction.
 The solar system is 4.6 billion years old.
 Most of the solar system is the sun.
 A light year is the distance light travels in a
year.

10.  Astronomers used to think that the Earth was
the center of the universe.
 The sun is just one out of 200 billion stars in the
milky way galaxy, but all the stars are really far
apart and well spread out.
 Jupiter acts as sort of a vacuum cleaner, and
pulls in things such as meteors, and comets.
 A season on Uranus lasts 22 years.
 When the moon is directly overhead you way
slightly less.