Earth & Motion
The imaginary line Earth spins on.
What is the axis?
The theory that the universe began as a single point and has been expanding ever since.
What is the Big Bang Theory?
The process in which lightweight hydrogen nuclei combine into heavier helium nuclei.
What is fusion?
The shape of a planet’s orbit.
What is an ellipse?
This theory explains the origin and expansion of the universe.
What is the Big Bang Theory?
This is Earth’s circular movement around its axis.
What is rotation?
The path described by one celestial body in its revolution around another.
What is an orbit?
The type of nuclear reaction in which a massive nucleus splits into smaller nuclei, releasing energy.
What is fission?
The Sun is not at the center of Earth’s orbit but at one of these points.
What is a focus?
This theory states that stars and planets formed from a cloud of gas and dust.
What is the Nebular Theory?
This is Earth’s orbital movement around the Sun.
What is revolution?
This term describes an elongated circle or oval, such as a planet’s orbit.
What is an ellipse?
This process powers stars, including our Sun.
What is fusion?
The path a satellite takes around Earth.
What is an orbit?
his effect explains how sound or light waves change frequency when the source moves toward or away from an observer.
What is the Doppler Effect?
The reference point for latitude, located at 0°.
What is the equator?
The Sun, stars, and planets are all part of this vast system.
What is the universe?
his energy reaction is used in nuclear power plants, not in stars.
What is fission?
The imaginary line around which Earth rotates.
What is the axis?
When light from an object in space shifts toward shorter wavelengths, it appears this color.
What is a blue shift?
The point between two objects where they balance each other.
What is the barycenter?
The study of celestial objects beyond Earth’s atmosphere.
What is astronomy?
The balance between fusion pushing out and gravity pulling in defines this stage in a star’s life.
What is equilibrium?
This term describes a planet’s tilt, affecting seasons.
What is axial tilt?
The idea that planets move in elliptical orbits was proposed by this scientist.
Who was Kepler?