Space.com: NASA, Space Exploration and Astronomy News
WEB2 days ago · Space.com covers the latest news and trends in spaceflight, science, technology and culture. Learn about NASA missions, black holes, alien life, spacewalks, telescopes and more.
Heliocentrism: Definition, origin and model | Space
WEBApr 8, 2022 · Heliocentrism is the theory that the sun is at the center of the solar system, rather than Earth. Learn about its history, importance and how it was revived by Nicolaus Copernicus and other ...
GPS: What is it and how does it work? | Space
WEBDec 6, 2022 · GPS is a U.S. system of 31 satellites that provide location, time and velocity signals to users on Earth. Learn about its origins, how it works, its uses and its evolution over the years.
What is the electromagnetic spectrum? | Space
WEBOct 29, 2021 · The electromagnetic spectrum is the collection of all electromagnetic radiation in the universe, from radio waves to gamma rays. It is the basis of energy and information transfer, and has many ...
What is a parsec? Definition and calculation | Space
WEBJul 29, 2022 · A parsec is a unit of distance that is often used by astronomers as an alternative to the light-year. Learn how it is derived from the parallax effect and how it relates to the light-year.
What is the gravitational constant? | Space
WEBSep 21, 2022 · The gravitational constant (G or Big G) is a fundamental constant of nature that describes the strength of gravity. Learn how it was measured by Henry Cavendish, and why some physicists suspect it ...
Perihelion: What is it and when does it occur? | Space
WEBJan 4, 2024 · Perihelion is the point in Earth's orbit where it is closest to the sun, which happens in early January. In 2024, perihelion occurred on Jan. 2 and Earth was 91,404,095 miles away from the sun.
Area 51: What is it and what goes on there? | Space
WEBJul 1, 2024 · Area 51 is a U.S. Air Force installation in Nevada that tests classified aircraft and has a long history of secrecy and rumors. Learn about its location, size, history, and why it is associated ...
Animals in space | Space
WEBJan 27, 2022 · Learn about the first animals to reach space, orbit Earth and land safely, from fruit flies to tortoises. Find out how animals helped scientists understand the impact of spaceflight on living beings.
What's the story behind the stars? | Space
WEBJun 1, 2021 · Learn how ancient cultures around the world saw the stars and created myths and legends to explain their patterns. Discover how the Greeks, Arabs, Polynesians, Egyptians, Mayans, and Chinese ...