Edwin hubble discovered that:

cepheids have patterns of brightness.
stars have absolute and apparent magnitudes.
the planets move in elliptical orbits around the sun.
galaxies in the universe are moving away from the earth.

Look at the images of different rocks. which rocks have a fine-grained texture? check all that apply. 1 2 3 4 5

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.