To distinguish among stars based on luminosity, astronomers use two different scales, one being the __________ scale that represents the value of a star’s apparent magnitude as if the star were hypothetically placed at a distance of exactly 10 parsecs from the Earth.

Ceres comprises 25% of the total mass of the asteroid belt. It has a spherical shape and orbits the Sun in 4.6 Earth years. Ceres is classified as a(n)

A high-mass star will end its life cycle as a

Antares and Spica have approximately the same apparent magnitude but Antares’ absolute magnitude is –5.2, whereas Spica’s absolute magnitude is –3.2. Which star is farther from the Earth?

How was the original scale for apparent magnitudes used by the ancient Greeks different from the modern scale? The original scale

The ecliptic plane doesn’t lie parallel to the celestial equator because the Earth’s axis of rotation has a __________ tilt relative to the plane of the Earth’s orbit around the Sun.

A planet does NOT necessarily have to

Which of the following can be seen over successive nights as it slowly moves across the sky until it dims and disappears?

The wind shown below occurs

The leeward side of a mountain range tends to be