Exam 22: Motions in the Heavens

The Doppler effect causes light from an object moving away from Earth to reach us at a lower frequency than it had when it was emitted.

What is a telescope?

Our constellations would not be recognizable if the stars were viewed from a planet very far from our Solar System.

Describe Earth's axis in terms of the direction that they point. What will happen in the future with Earth's axis?

The Moon goes through phases because it is much farther from Earth at one end of its orbit.

How are instruments carried aloft by spacecraft important?

A Doppler shift toward longer wavelengths is called a(n) ____________________ shift.

As Earth rotates on its axis, it wobbles like a spinning top in a motion called ____________________.

The ____ lens is farthest from the eyepiece in a refracting telescope and collects light from a distant object.

Describe Brahe and Kepler's contributions to astronomy.

____________________ argued that if Earth were moving, people would fall off.

The phenomenon that causes the pitch of a passing train's whistle to sound higher than usual as it approaches, and lower than usual as it travels away, is called ___.

As light passes from the hot interior of a star through the cooler outer layers, ____.

A(n) ____________________ uses a curved mirror to collect light and focus an image.

Describe the Earth's spin and rotation.

The lunar cycle, from one new moon to the next, takes about ____.

The nighttime glow of city lights that competes with the light of distant stars and reduces the vision of a telescope is referred to as ____________________.

Mars appears to reverse direction and drift westward across the sky at times because ____.

The waxing gibbous moon ____.

Absorption spectra can be used to detect ____.