E&S Study Guide 1st Semester

Front

What is the Geocentric Model?

Back

The Geocentric Model is an astronomical theory that places the Earth at the center of the universe, with all other celestial bodies orbiting around it.

Front

What is the Heliocentric Model?

Back

The Heliocentric Model is an astronomical theory that places the Sun at the center of the solar system, with the Earth and other planets orbiting around it.

Front

What is perihelion?

Back

Perihelion is the point in the orbit of a planet where it is closest to the Sun.

Front

What is aphelion?

Back

Aphelion is the point in the orbit of a planet where it is farthest from the Sun.

Front

Who proposed the Heliocentric system?

Back

Nicolaus Copernicus proposed the Heliocentric system.

Front

What is a singularity in the context of the Big Bang?

Back

A singularity is a point in the universe where density and gravitational forces are thought to be infinite, containing all the mass, energy, and time of the universe before the Big Bang.

Front

What is the significance of the Big Bang?

Back

The Big Bang is the leading explanation for the origin of the universe, describing how it expanded from a singularity into its current state.

Front

What is the barycenter?

Back

The barycenter is the center of mass around which two or more bodies orbit, such as the Earth and the Moon.

Front

What is the Earth's axial tilt?

Back

The Earth's axial tilt is approximately 23.5 degrees, which affects the seasons as the Earth orbits the Sun.

Front

What happens during the equinox?

Back

During the equinox, day and night are approximately equal in length, occurring twice a year when the Sun crosses the celestial equator.