A 3rd magnitude star is 3 times brighter than a 1st magnitude star.

A ______________ is an array of electromagnetic radiation and a ___________ is an instrument that spreads light according to color.

Earth doesn’t experience a solar eclipse every month because

The first-quarter Moon rises

Saturn orbits the Sun and follows which laws? Choose the best answer. I. Kepler’s first II. Kepler’s second III. Kepler’s third IV. Newton’s law of gravitation  

A geocentric universe is Sun centered.

If the Sun passes directly overhead on at least one day per year, then

The Moon physically changes its shape throughout its orbit around the Earth giving us the phases of the Moon we see.

The star Vega has an apparent visual magnitude of 0.03 and the star HR 4374 has an apparent visual magnitude of 4.87. It has been determined that both stars are at the same distance from Earth. What does this information tell us about the two stars?

The ecliptic can be defined as