Key Concepts in Astronomy and the Big Bang Theory

Flashcards summarizing key concepts related to gravity, the solar system, and the Big Bang theory.

Gravity

The force responsible for the formation of the solar system, pulling together gas and dust.

The Sun

The most massive object in our solar system, exerting the greatest gravitational force that keeps the planets in orbit.

The Big Bang

A theory stating that all matter in the universe existed in a single point 14 billion years ago.

Inflation

The superfast expansion of energy and space that occurred after the Big Bang.

Hubble's Law

Proposed that if all matter in space is moving away, it must have started from the same spot; the distance of a star is proportional to its redshift.

Redshift

The phenomenon that allows scientists to understand that galaxies are moving away from Earth, indicating the expansion of the universe.

The Doppler Effect

A change in the frequency or wavelength of light from the stars due to their movement, used to determine that galaxies are moving away from Earth.

The first elements after the Big Bang

Hydrogen and helium, the first atoms formed as the universe cooled.

Abundance of elements

Refers to the large amount of hydrogen and helium found in outer space, supporting the Big Bang theory.

Background radiation

An echo from the Big Bang, providing evidence for the theory.