These graphs also show if the object is moving at a constant speed or accelerating, decelerating, or still. Acceleration is shown by a straight rising line. Deceleration is shown by a straight ...

The Hubble constant is one of the most important numbers in cosmology because it tells us how fast the universe is expanding, which can be used to determine the age of the universe and its history. It ...

These graphs also show if the object is moving at a constant speed or accelerating, going back to the starting point, or stationary. Constant speed is shown by a straight rising line. The gradient ...