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网页1 天前 · Get the latest space exploration, innovation and astronomy news. Space.com celebrates humanity's ongoing expansion across the final frontier.
Heliocentrism: Definition, origin and model | Space
网页2022年4月8日 · Because nobody was able to explain why the stars looked the same despite Earth changing position, the geocentric model became more widely recognised. Egyptian astronomer and mathematician Claudius ...
Earth's magnetic field: Explained | Space
网页2022年7月6日 · Earth has two sets of poles, geographic pole and magnetic poles. Earth's magnetic field can be visualized if you imagine a large bar magnet inside our planet, roughly aligned with Earth's axis.
Why is the sky blue? - Space.com
网页2022年8月25日 · The sky isn't always blue. When the sun is low in the sky, at sunrise or sunset, it can take on a red hue. This is explained by the same physics — Rayleigh scattering — as the blueness of the ...
Best sci-fi movies of all time | Space
网页2022年7月25日 · (Image credit: Sony Picture Classics) Release date: June 12, 2009 Cast: Sam Rockwell, Kevin Spacey, Dominique McElligott A sci-fi movie centered on isolation, Moon follows astronaut Sam Bell (Sam ...
Track the ISS: How and where to see it - Space.com
网页2024年6月27日 · ISS predictions and alerts. NASA's spot the station widget (below) is a great tool for quickly finding out upcoming ISS viewing opportunities. Simply pop in the location you wish to know for ISS ...
Milky Way galaxy: Facts about our cosmic neighborhood | Space
网页2023年4月18日 · The Milky Way galaxy is our cosmic home. A barred spiral galaxy stretching 100,000 light-years across. Here we explore our galactic neighborhood in more detail.
Starlink satellite train — how to see and track it | Space
网页2024年7月24日 · Starlink train visible over Ankara, Turkey. (Image credit: Ismail Duru/Anadolu Agency via Getty Images) To find out when you can see a Starlink satellite near you, check out this Starlink locator ...
Perihelion: What is it and when does it occur? | Space
网页2024年1月4日 · Perihelion is the point at which an orbiting body is closest to the sun. The word comes from Greek and literally means around (peri) the sun (helios).
How big is Earth? | Space
网页2021年7月6日 · The volume of Earth is 260 billion cubic miles (1.086 trillion cubic kilometers), while its mass is 6.6 x 10 21 tons (6 x 10 21 metric tons), according to NASA. With these values known, and Earth ...