Science can say nothing about the validity of nonscientific practices that do not make testable predictions.

A photon is _________________?

Astrology is considered a pseudoscience because

The largest telescopes in the world are all reflecting Why is that?

One degree can be divided into arcminutes. Arcminutes can be divided into arcseconds. How many arcseconds are there in one degree?

We see a full moon in our sky only when __________.

Match the following concepts with the correct explanation

One difference between the terms solar system and galaxy is that

One light-year is equal to __________.

Two forms of electromagnetic radiation that penetrate Earth’s atmosphere are: