Astronomy

Universe: Everything that exists
Galaxy: It is a lot of stars that is close together, caused by gravitational force. There are more than 170 billion galaxies in the universe.

 Constellations: it is pictures that are made in the stars, it is believed to show signs. Astronomers made these constellations, to break up the stars from viewing point. there are88 constellations. 

Solar system: It is the 8 planets that moves in the orbits around the sun: mercury, Venus, Earth, mercury, Jupiter ( biggest), Saturn( only one with a ring), Uranus, Pluto( is not seen as a planet any more).

Phases of he moon: As the moon circles the earth, the shape of the moon changes, it is because the earth comes between the sun and the moon. when the moon is completely blocked out, it is called a Lunar eclipse

Solar eclipse: it is when the moon comes in between the earth and the sun and the sun is blocked out by the moon, it only last a few seconds, and can only be seen at a certain point on earth.

Tides: It is the rise and fall of sea levels, caused by the gravitational force of the moon and the sun on the water. Most places on earth have 2high and 2 low tides per day
Milky way: It is our galaxy, It's a broad band of stars from viewing point. It has 100-400 billion stars.

Shooting stars: It is a ball of dust and gasses that hits the atmosphere and disintegrates immediately

Meteorites: a solid rock from space entering the atmosphere and crashing into earth