asteroid
comet
definition: light year
earth orbits the sun (revolves) once every year....
galaxy
how big is the milky way galaxy?
how big is the universe?
how big is the universe?
how did we come to be? part 1
how did we come to be? part 2
how do our lifetimes compare to the age of the universe?
how far would you have to walk to reach alpha centauri?
how is earth moving in our solar system?
how many stars in our solar system?
hubble discovered that
is our sun the center of the milky way galaxy
local group galaxies
medium and large moons
moon (or satellite)
more detailed study of the milky way (spiral galaxy)
nebula "clouds"
planet
planets
small moons
solar (star) system
star
stars
universe
what is our place in the universe?
what is our place in the universe?