Reference Black holes are real, they're some of the strangest objects in space. Discover what black holes are and how they form with our informative black hole guide.
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 Cosmology by definition is the branch of astronomy involving the origin and evolution of the universe, from the Big Bang to the future of the cosmos.
Reference This list of famous astronomers includes great scientists in history who mastered many fields and modern astronomers who helped popularize astronomy.
Reference The temperature of Uranus averages minus 320 degrees Fahrenheit. Uranus holds the record for the coldest temperature ever measured in the solar system.
The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun.
Since its 1990 launch, the Hubble Space Telescope has provided countless amazing images and contributed to many big discoveries. Learn more here.
Reference Roughly 80% of the mass of the universe is made up of dark matter, a material that scientists cannot directly observe. So why do scientists think it dominates?
Reference Based on what we can observe, the universe appears to be almost 28 billion light-years in diameter. However, it is far larger than that.
reference Most stars are main sequence stars that fuse hydrogen to form helium in their cores - including our sun.
Reference Sir Isaac Newton invented calculus and explained optics. His most significant work involved forces and the development of a universal law of gravity.
A red giant star is a dying star in the last stages of stellar evolution. Our own sun will turn into a red giant, expand and engulf the inner planets — possibly even Earth.
Reference How long it takes to get to Mars depends on several factors including planetary position and available technology.
Nicolaus Copernicus proposed his theory that the planets revolved around the sun in the 1500s, when most people believed that Earth was the center of the universe.
Reference The wormhole theory postulates that a theoretical passage through space-time could create shortcuts for long journeys across the universe.
Reference Albert Einstein's theory of general relativity is based on the idea that massive objects cause a distortion in space-time, which is felt as gravity.
Nibiru has been linked to NASA, and is also sometimes referred to or confused with Planet X, another supposed world for which there is no evidence.
The solar system formed about 4.5 billion years ago. Scientists have developed three models of how it happened.
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 Carl Sagan was a scientist and educator best known for his TV series Cosmos, the Pale Blue Dot image of Earth and quotes about life and Earth.