Daisy Dobrijevic

Reference White dwarfs are hot, dense remnants of stars. They are the last observable stage of evolution for low and medium-mass stars including our sun.

Reference Mars missions have been launching for over 50 years. Humanity has sent orbiters, probes and landers to Mars but not every mission has been successful.

Reference Mars' atmosphere is over 100 times thinner than Earth's and is primarily composed of carbon dioxide, nitrogen and argon gases.

Reference White holes are theoretical cosmic regions that are opposite to black holes. Just as nothing can escape a black hole, nothing can enter a white hole.

Reference The Star of Bethlehem led the three wise men to Jesus' birth, according to the New Testament. But what was the Star of Bethlehem? There are several theories.

Reference The temperature of Uranus averages minus 320 degrees Fahrenheit. Uranus holds the record for the coldest temperature ever measured in the solar system.

Reference Hale-Bopp was an unusually bright comet that flew close to Earth in 1997. Tragically, Hale-Bopp also influenced the Heaven's Gate cult's mass suicide.

Reference The distance to Mars from Earth constantly changes as they orbit the sun. The average distance between Earth and Mars is 140 million miles (225 million km).

Reference How big is the moon? Our moon is the fifth largest moon in the solar system, with a radius of 1,079.6 miles (1,737.5 kilometers).

Reference The cosmic microwave background (CMB) is primeval radiation emitted shortly after the Big Bang. Regarded as an 'echo' of the Big Bang, CMB fills the universe.

Reference Saturn is the sixth planet from the sun and the second-largest planet in the solar system. We explore this gas giant in more detail here.

The moon-landing hoax is still believed by some – over 50 years since Apollo 11. We look at why people still think the whole thing never happened.

Reference The sun's temperature varies from around 27 million degrees Fahrenheit (15 million degrees Celsius) in the core to about 10,000 degrees F (5,500 degrees C) at the surface.

Reference Neil Armstrong was a NASA astronaut, aeronautical engineer and the first person to walk on the moon, on July 20, 1969.

Reference How long it takes to get to Mars depends on several factors including planetary position and available technology.

Reference We explore some of the best Hubble Space Telescope images of all time including nebulas, galaxies, planets and more!

Reference Redshift and blueshift describe the change in the frequency of a light wave depending on whether an object is moving towards or away from us.

Reference Find out how track the International Space Station from Earth and see where it is right now.

REFERENCE If you could journey through the cosmos' most monstrous objects, what tales — if any — would you be able to tell?

Reference Earth's atmosphere protects the planet and sustains life.

Reference The geocentric model is a debunked theory that the Earth is the center of the universe, with the sun and planets revolving around it.

Reference Stephen Hawking was regarded as a brilliant theoretical physicist. His work on black holes and the big bang are topics of popular books.