Outer Space & Universe
Outer Space & Universe
Space, also known as outer space, is the near-vacuum between celestial bodies. It is where everything (all of the planets, stars, galaxies and other objects) is found.
On Earth, space begins at the Kármán line (100 km above sea level). This is where Earth's atmosphere is said to stop and outer space begins. This is not a firm boundary but is a convention used by scientists and diplomats.
Items in space are free to move back and forth; up and down; and left and right. These three dimensions are what make 3D space. Items also move forward through time, which is sometimes called the fourth dimension.
The majority of space contains very little matter and so most of it is a vacuum. Scientists do not know how big space is but we do know that space is extremely big, and is always expanding.
According to the big bang theory, all matter and energy in the Universe was compressed into a very small space. Then it exploded and started expanding. Space is still growing in size today; this means the distance from one galaxy to distant galaxies is getting longer.
Gravity is the force that keeps the Moon in orbit around the Earth and the planets in orbit around the Sun. Gravity can stretch and bend space similar to how a heavy ball placed on a stretched sheet of rubber will cause the rubber to stretch. The scientist who discovered that space can bend is named Albert Einstein. How gravity bends space is part of his theory of general relativity.
Astronauts, Cosmonauts, Taikonauts and Spationauts
An astronaut is any person who is trained by NASA to travel and perform tasks in space. Although the space traveler may not necessarily be a United States citizen, each astronaut does go through a rigorous training regiment by the National Aeronautics and Space Administration. Other space travelers go by other names then astronaut depending on their country of origin.
In the United States, astronaut is derived from the Greek words ástron (star) and nautis (sailor). While, in Russia, a space traveler goes by the name космонавт (English: cosmonaut), which is derived from the Greek words kosmos (universe) and nautis (sailor). Westerners call a space traveler from China a taikonaut, based on the 1998 writings of Chiew Lee Yik and Chen Lan where the term tàikōng (great emptiness), Chinese for “space”. In China, the term yuháng yuán (universe navigator) is used for space traveler.
Only the United States of America (United States), Russia (earlier, the Union of Soviet Socialist Republics), and the People’s Republic of China (China) have sent manned spacecraft into space. Other countries have assisted these countries by sending their own space travelers on space missions. For instance, a French space traveler is called a spationaut (from the French word spationaute), which is derived from the Latin spatium (space) and Greek nautis (sailor). (plural in Greek nautes = sailors)
01:10Added 531 Views / 0 Likes
Pluto Fly-By Video From New Horizons' Images By Björn Jónsson
07:01Added 530 Views / 0 Likes
It's Naked Eye visible way ahead of schedule! Comet C/2014 Q2 LoveJoy
03:39Added 528 Views / 0 Likes
Earth's Cousin Find 'Whispers The Possibility That We Are Not Alone' | Video
00:57Added 526 Views / 0 Likes
Cosmic Yin-Yang of Double Disc Binary Stars Recasts Exoplanet Search | Video
01:36Added 523 Views / 0 Likes
NASA JSC's prototype planetary lander made its fastest (~30 mph) and highest ascent (580 feet) on March 11, 2014. The flight lasted 83-seconds and it touched down on a landing pad 837 feet 'downrange' from the launchpad.
01:13Added 523 Views / 0 Likes
Apollo 11 Moon Landing Site Spied By Orbiter | Video
01:09Added 519 Views / 0 Likes
Fire Fountain Volcano On Moon Carved Deep Channel? Orbiter View | Video
03:45Added 518 Views / 0 Likes
Gigantic Earth facing Sunspot & a Solar Flare Solar Freak Out
03:51Added 516 Views / 1 Likes
Scary Frankenstein Storms happening across the World!
03:54Added 514 Views / 0 Likes
The Remote Robotic Oxidizer Transfer Test (RROxiTT) was successfully completed when a unique propellant transfer system (PTS) pumped fuel in to mock tank at the NASA KSC (Florida), while being controlled at NASA Goddard (Maryland).
01:57Added 512 Views / 0 Likes
Happy New Year! 2015 Let Love Rule! and comet Q2!
49:53Added 511 Views / 0 Likes
Planet Earth 100 Million Years In The Future - What will happen to our world? - HD Full Documentary
02:48Added 509 Views / 0 Likes
Monster Winter Storm Orson headed to East Coast USA. Bombogenesis!
02:01Added 508 Views / 0 Likes
NASA 3D Prints Injectors for 'SLS-Mini' Test Firing | Video
08:09Added 508 Views / 0 Likes
Blood Moon #4 is a Super Moon Total Lunar Eclipse with weirdos.
02:21Added 505 Views / 0 Likes
Using the Atacama Large Millimeter/submilimeter Array in Chile, astronomers probed the supermassive black holes that are at the center of most galaxies, principally to analyze the molecular gas their massive gravity wells propel into powerful jets.
01:07Added 505 Views / 0 Likes
A star (Kepler 296 system) about half the size of our Sun is harboring at least 5 planets. It is not yet known if the outermost planet, in the habitable zone (green area in video), called Kepler-296f, is a gas or water world.
03:13Added 505 Views / 0 Likes
Solar Feast of Crows - Enter the Sun Dragon part IV
00:59Added 503 Views / 0 Likes
Galaxy Merger Tails Sprout Dwarfs | Animation
05:51Added 502 Views / 0 Likes
WOW! Science may have just found ALIEN LIFE! Disclosure! A Dyson Sphere MegaStructure!