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 Everything you need to know about the James Webb Space Telescope, NASA's Big Bang-probing space observatory.

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 Explore the eight (or nine) planets of the solar system from the closest to the sun to the furthest, as well as the controversial planet nine.

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

Reference NASA’s Lucy mission is the first to visit the Trojan asteroids. Lucy will help answer questions about the formation of the solar system.

Reference The Orion Nebula (Messier 42) is the nearest star-forming region to Earth, about 1,350 light-years away. It is located in the Orion Constellation, just below Orion's Belt.

Reference Most stars in the universe will eventually burn off all of their hydrogen and become dead husks called white dwarfs.

Reference The Orion Constellation — named after the hunter in Greek mythology — is found on the celestial equator and is a prominent constellation in the night sky.

Reference There are a few good theories for a multiverse — an infinite number of parallel universes besides our own.

Reference NASA's DART (Double Asteroid Redirection Test) mission is the first-ever space mission designed to test planetary defense technologies in asteroid deflection.

Reference Space shuttle Columbia was the first shuttle in space and performed 28 flights. Columbia's final flight ended in disaster as it broke apart during re-entry.

REFERENCE The space shuttle Columbia broke up on Feb. 1, 2003, killing its seven-member crew. An investigation led to changes in NASA procedures.