Star A has an apparent visual magnitude of 13.4 and star B has an apparent visual magnitude of 15.4. Star A is ____ than star B.

An eclipse of the Moon (lunar eclipse) as seen from Earth, happens when

If a satellite is in orbit around Earth and the satellite’s altitude is decreased, then the circular velocity __________________.

Which of the following objects cannot transit (i.e., pass in front of) the Sun as seen from Jupiter?

The radiation emitted from a star has a maximum intensity at a wavelength of 500 nm. What is the temperature of this star?

Galileo’s telescopic discoveries of mountains on the Moon and spots on the Sun were controversial because they suggested that the Sun and Moon

The wavelength of the hydrogen line from level 1 to level 2 in a hot star is ____________ the wavelength of the same line in a cool star. The stars have the same radial velocities away from Earth.

An apparent westward motion of a planet in the sky compared to the background stars (as viewed from Earth) when observed on successive nights is referred to as

The celestial equator always passes directly overhead.

____ is the point in Earth’s orbit where Earth is closest to the Sun.