Astronomy Worksheet

The orbit of a planet is an ellipse with the Sun at one of the two foci.

• What is Kepler’s First Law?

• What is Kepler’s Second Law?

• What is Kepler’s Third Law?

• What is Law of Copernicus

The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its orbit.

• What is Kepler’s First Law?

• What is Kepler’s Second Law?

• What is Kepler’s Third Law?

• What is orbital period?

Analyze the diagram and explain the relationship between luminosity and surface temperature for different spectral classes.

• Luminosity increases with surface temperature across spectral classes.

• Luminosity decreases with surface temperature across spectral classes.

• Luminosity remains constant with surface temperature across spectral classes.

• There is no relationship between luminosity and surface temperature across spectral classes.

Why do H II regions glow?

• They are full of glowing supernovae

• They are mostly composed of H+, ionized by young stars emitting UV

• They are the hottest places in the universe, constantly emitting light

• They are made of carbon, hydrogen, helium, and other light refracting elements

H II regions are also called

• Stellar nurseries

• Supernovae

• Cosmic clouds

• Protostellar regions

The Sun has a mass of

• 1/10 of a solar mass

• 1 solar mass

• 10 solar masses

• 100 solar masses

What is a protoplanetary disk?

• Leftover gas from a star’s formation; a viable birthplace for planets

• A stellar nursery for smaller (G-M) stars

• A gas disk that absorbs planets to grow, forming a young star

• An optical illusion created by UV light refracting through nebulae

Which of the following are characteristics of the red giant branch? Select all that apply

• Increasing luminosity

• Decreasing luminosity

Which principle in quantum mechanics explains the support mechanisms for white dwarfs and neutron stars?

• Heisenberg uncertainty principle

• Superposition

• Wave-particle duality

• Pauli exclusion principle

Identify the star.

• Sirius

• Betelgeuse

• Polaris

• Vega