Astrophysics and Cosmology

A spectrum containing dark lines where specific wavelengths have been absorbed by a cooler gas.

hot material orbiting and falling toward a compact object.

technology that corrects astronomical images for distortions caused by Earth's atmosphere.

the point in an orbit farthest from the Sun.

How bright a star appears from Earth.

computer systems capable of tasks such as pattern recognition, classification, and prediction.

a human-made object placed into orbit.

precise measurement of the positions and motions of stars.

The average distance between the Earth and the Sun (about 150 million kilometres).

the application of physics to understanding astronomical objects and the Universe.