The blue, hotter stars tend to have shorter lifetimes than the red, cooler stars.
true
false

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

The heliocentric and the geocentric models of the solar system included these central principles