the science of matter and energy and their interactions

a physicist who studies astronomy

the branch of astronomy that studies the motion of natural and artificial bodies in space

the branch of astronomy that deals with the measurement of the position and motion of celestial bodies

the branch of astronomy that detects and studies the radio waves emitted by celestial bodies

the branch of astronomy concerned with the application of Newton's laws of motion to the motions of heavenly bodies

the branch of astronomy concerned with the physical and chemical properties of celestial bodies

(of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions

(of the sun) characterized by a low level of surface phenomena, such as sunspots

moving from west to east on the celestial sphere; or--for planets--around the sun in the same direction as the Earth

moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth

having an orbit farther from the sun than the Earth's orbit