Astrology Mid Term

Front

What is cosmic microwave background (CMB)?

Back

Leftover radiation from the Big Bang, or the time when the universe began.

Front

What is Hubble's Law?

Back

The observation that the farther away a galaxy is, the faster it is moving away.

Front

What happens to a wave's wavelength if its frequency doubles?

Back

The wavelength is halved.

Front

What did Henrietta Leavitt demonstrate using variable cepheid stars?

Back

She demonstrated that some stars have consistent absolute magnitudes and used this to determine their distances from Earth.

Front

True or False: Seasons are caused by the tilt of the moon's axis.

Back

False.

Front

What is the significance of the cosmic microwave background in astronomy?

Back

It provides evidence for the Big Bang theory and helps in understanding the early universe.

Front

Define absolute magnitude in the context of stars.

Back

Absolute magnitude is the measure of the intrinsic brightness of a star, defined as the brightness it would have at a standard distance of 10 parsecs.

Front

What is the relationship between frequency and wavelength in waves?

Back

Frequency and wavelength are inversely related; as frequency increases, wavelength decreases.

Front

What is the role of cepheid variable stars in measuring astronomical distances?

Back

Cepheid variable stars have a known relationship between their luminosity and pulsation period, allowing astronomers to calculate their distances.

Front

What does the term 'redshift' refer to in astronomy?

Back

Redshift refers to the phenomenon where light from an object is shifted to longer wavelengths, indicating that the object is moving away from the observer.