Unit 3 Astronomy Regents Earth Science

Front

What is Earth's eccentricity?

Back

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Front

What does it mean when light from distant stars has shifted to the red-end spectrum?

Back

It indicates that the stars are moving away from Earth, showing a redshift due to the Doppler effect.

Front

List the sequence of stars in order of increasing luminosity: Procyon B, Sun, Sirius, Betelgeuse.

Back

Procyon B, Sun, Sirius, Betelgeuse.

Front

Which star is cooler and less luminous than the Sun?

Back

Proxima Centauri.

Front

If the average distance between Earth and the Sun were doubled, what happens to the Sun's gravitational pull on Earth?

Back

The gravitational pull would decrease.

Front

If the average distance between Earth and the Sun were doubled, what happens to Earth's period of revolution?

Back

The period of revolution would increase.

Front

What is the definition of luminosity in astronomy?

Back

Luminosity is the total amount of energy emitted by a star per unit time.

Front

What is the significance of a star's color in determining its temperature?

Back

A star's color indicates its surface temperature; blue stars are hotter, while red stars are cooler.

Front

What is the relationship between a star's mass and its lifespan?

Back

More massive stars have shorter lifespans due to faster nuclear fusion rates.

Front

What is the Doppler effect in relation to astronomy?

Back

The Doppler effect refers to the change in frequency or wavelength of light from an object moving relative to an observer.