1. Our Solar System

3. our solar system is in the Milky Way galaxy
composed of the Sun (a G2 star - yellow dwarf) and everything that orbits it
sun is 99.8% of the mass
Planets: 0.135%
Comets: 0.01% ?
Satellites: %
Minor Planets: % ?
Meteoroids: % ?
sun’s gravity keeps the planets in orbit
uses hydrogen for nuclear fusion (fuel)
makes He-4, and isotope of helium
a satellite is an object in orbit around a larger mass
around 135 satellites are orbiting the planets in our solar system

4. Measuring Astronomical Unit (AU) light years
roughly the distance from the Earth to the Sun, about 93 million miles.
light years
the distance light will travel uninterrupted

5. Solar System

6. Solar System, plus Sun

7. The Moon

8. only natural satellite of earth
has no atmosphere
gravity is about 1/6 of earth
light comes from the Sun that is reflected off the Moon's surface.
covered with craters caused by asteroids during the formation of the solar system
moon’s gravity pulls on earth’s water creating high and low tides.

9. phases of the moon
appears to be different shapes depending on its position relative to earth
time between new moons is 29.5 days
waxing is when the moon is “getting” bigger
waning is when the moon is “getting” smaller

15. Eclipses
occurs when one object moves into the shadow cast by another object
solar eclipse
moon blocks out the sun from reaching an area on earth

16. lunar eclipse
earth blocks the sun from reaching the moon

17. Formation of the Solar System
about 4.6 billion years old
probably began as a nebula-- a large cloud of dust in space
collapsed into a large, rotating, disk-shaped cloud
continued to collapse and the material in the middle became hot and dense (the Sun)
planets begin to form by accretion where particles collide and stick together

19. the planets, moons, and asteroids of our solar system orbit the Sun in about the same angle called the ecliptic plane