Stars and Galaxies Online Quiz

Supergiants are the largest stars in the universe in terms of physical volume. They are significantly larger than red giants, white dwarfs, or blue giants.

Scientific estimates for the number of stars in the Milky Way galaxy typically range between 100 billion and 400 billion. 200 billion is the most widely accepted average estimate.

Stars are primarily composed of hot gas, specifically hydrogen and helium, held together by gravity. The extreme pressure and heat cause nuclear fusion in their cores.

The Big Bang is the prevailing cosmological model for the origin of the observable universe. It describes the expansion of the universe from an extremely hot and dense state.

Proxima Centauri is the closest star to our solar system, located about 4.24 light-years away. It is part of the Alpha Centauri star system.

The Sun produces energy through nuclear fusion, where hydrogen atoms fuse together to form helium. This process releases a massive amount of energy in the form of light and heat.

In stellar classification, color is an indicator of temperature. Blue stars are the hottest, followed by white, yellow, and red stars, which are the coolest.

Our solar system is located within the Milky Way galaxy. It is a barred spiral galaxy.

The Sun is classified as a G-type main-sequence star. It is currently in the stable phase of its life cycle, where it fuses hydrogen into helium.

A constellation is a group of stars that appear to form a pattern in the night sky. These patterns have been used for navigation and storytelling throughout history.