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Outer Space & Universe

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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)

 

  • 10:33 This energy is wild. imho

    This energy is wild. imho

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  • 10:32 This Hurricane season is about to get Wild & Dangerous. Imelda et al.

    This Hurricane season is about to get Wild & Dangerous. Imelda et al.

    by Shubnigg Added 402 Views / 0 Likes

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  • 05:22 This is a Test

    This is a Test

    by Shubnigg Added 372 Views / 0 Likes

    HD face

  • 17:04 THIS IS A TEST - planetary alignment - Sun - planets & stuff topic

    THIS IS A TEST - planetary alignment - Sun - planets & stuff topic

    by Shubnigg Added 474 Views / 0 Likes

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  • This is a Test.

    This is a Test.

    by Shubnigg Added 151 Views / 0 Likes

  • 16:05 This is an official Early June Hurricane Watch for Gulf & East Coast.

    This is an official Early June Hurricane Watch for Gulf & East Coast.

    by Shubnigg Added 403 Views / 0 Likes

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  • 05:26 This is Bob Behnken

    This is Bob Behnken

    by Shubnigg Added 358 Views / 0 Likes

    The first American astronauts to launch on an American rocket in almost nine years are about to make history, and this is your chance to learn who they are. NASA astronaut Bob Behnken talks about his career as an astronaut, what he expects on launch day a

  • 05:18 This is Doug Hurley

    This is Doug Hurley

    by Shubnigg Added 422 Views / 0 Likes

    One of the astronauts who was on the last space shuttle mission almost nine years ago is about to fly again! NASA astronaut Doug Hurley is commanding the first SpaceX Crew Dragon flight with astronauts on board. Listen to him talk about the plans for this

  • 01:27 This is SpaceX

    This is SpaceX

    by shub Added 362 Views / 0 Likes

    SpaceX designs, manufactures, and launches the world's most advanced rockets and spacecraft. The company was founded in 2002 by Elon Musk to revolutionize space transportation, with the ultimate goal of enabling people to live on other planets. Today, Spa

  • 06:03 This is Weird.

    This is Weird.

    by Shubnigg Added 280 Views / 0 Likes

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  • 03:50 This Ring of Fire Solar Eclipse is going to Kick 2020 into High Gear with Extra Weird Challenges

    This Ring of Fire Solar Eclipse is going to Kick 2020 into High Gear with Extra Weird Challenges

    by Shubnigg Added 361 Views / 0 Likes

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  • 05:31 This sky: part 3 the city

    This sky: part 3 the city

    by Shubnigg Added 199 Views / 0 Likes

  • 10:40 This Sort of feels like Wild 5 days after an Eclipse Weather.

    This Sort of feels like Wild 5 days after an Eclipse Weather.

    by Shubnigg Added 204 Views / 0 Likes

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  • 01:29 This star system will 'one day' generate a kilonova explosion

    This star system will 'one day' generate a kilonova explosion

    by Shubnigg Added 251 Views / 0 Likes

    The SMARTS 1.5-meter Telescope at the Cerro Tololo Inter-American Observatory (CTIO) has observed a star system that "will one day form a kilonova — the ultra-powerful, gold-producing explosion created by merging neutron stars," according to NSF's NOIRLab

  • 09:36 This storm is LIT. 179 Rivers Flooding. Indiana & surrounding area in trouble.

    This storm is LIT. 179 Rivers Flooding. Indiana & surrounding area in trouble.

    by shub Added 476 Views / 0 Likes

    I didn't realize there was such a bad confluence of river flooding until the end of the video. This is a slow moving storm that is pumping out some nasty wind, tornadoes, hail and rain. 70 mph winds have been reported in non-tornado areas. If you are in i

  • 09:15 This Storm is really kicking into Gear.

    This Storm is really kicking into Gear.

    by Shubnigg Added 300 Views / 0 Likes

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  • 11:19 This Storm is some Next Level shiz.

    This Storm is some Next Level shiz.

    by Shubnigg Added 397 Views / 0 Likes

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  • 18:23 This storm is the START of 2+ weeks of Rain for East Coast.

    This storm is the START of 2+ weeks of Rain for East Coast.

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  • 05:39 This storm is weird & the next storm is bringing 20 foot waves to the whole west coast.

    This storm is weird & the next storm is bringing 20 foot waves to the whole west coast.

    by Shubnigg Added 414 Views / 0 Likes

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  • 07:14 This Storm looks like Pegasus.

    This Storm looks like Pegasus.

    by Shubnigg Added 107 Views / 0 Likes

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