Blog

Galileo is credited with designing the first reflector telescope.

Stars do not twinkle; the instability of the atmosphere causes this effect.

According to Newton’s laws, the planets orbit the Sun due to __________.

Among Galileo’s discoveries with his telescope were sunspots.

According to Newton’s second law, if you double the force acting on a body, the acceleration will double.

Ptolemy’s model was ____________ with the earth fixed in the center of the universe.

Copernicus believed the Sun was the center of all celestial motion.

The greatest angular distance above or below the ecliptic the Moon can move is 

A blue star has a higher surface temperature than a red star.

In Ptolemy’s geocentric model, the normal eastward motion of the planets was along what circle?