Astronomy

1
Astronomy

• Chapter 2

2
Geocentric

• A description of the solar system that involves
  all of the planets revolving around the Earth.

3
Heliocentric

• A description of the solar system in which all
  planets revolve around the sun.

4
Ellipse
An oval shape, or an elongated circle which is
the shape of a planets orbit.
5
Inertia

• The tendency of a moving object to stay in a
  straight line or a stationary object to remain in
  place.

6
Gas Giants

• The name given to the first four outer planets
  Neptune, Uranus, Saturn and Jupiter.

7
Terrestrial Planets

• The name given to the four inner planets,
  Mercury, Earth, Venus and Mars.

8
Core

• The center of the sun, where nuclear fusion takes
  place.

Core
9
Nuclear Fusion

• The production of energy as hydrogen atoms
  combine to form helium.

Hydrogen
Energy
Helium
10
Photosphere

• The inner layer of the suns atmosphere. This
  sphere is the light that we see from Earth as we
  look at the sun.

Photosphere
Photosphere
11
Chromosphere

• The middle layer of the suns atmosphere. The
  chromosphere is 5,000-10,000C. The chromosphere
  is the color sphere.

Chromosphere
12
Corona

• The corona is the outer layer of the suns
  atmosphere, it is 2,000,000C.

Corona
13
Solar Wind

• A stream of electrically charged particles made
  by the suns corona.

14
Sunspot

• A dark area of gas on the sun that is cooler than
  surrounding gases.

15
Prominence

• A loop of gas from one sunspot region to another.

16
Solar Flare

• An explosion of hydrogen gas on the suns surface
  that is caused by connecting loops in sunspot
  regions.

17
Retrograde Rotation

• The spinning in the opposite direction of most
  planets and moons, from east to west.

18
Greenhouse Effect

• The trapping of heat by a planets atmosphere.

19
Comet

• A ball of dust and ice that orbits in an long
  narrow ellipse.

20
Asteroid

• Objects that are revolving around the sun, but
  are too numerous and too small to be considered
  planets.

21
Asteroid Belt

• The area in the solar system between the orbits
  of Mars and Jupiter this is where many asteroids
  are found.

22
Meteoroid

• A chunk of rock or dust in space.

23
Meteor

• A streak of light in the sky that is produced by
  the burning of a meteoroid in the Earths
  atmosphere.

24
Meteorite

• A meteor that has hit Earths surface.

25
Extraterrestrial Life

• Life that comes from outside of the Earth.