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)
-
01:58
SpaceX 'BFR' Could Deliver Superfast Travel on Earth
Added 539 Views / 0 LikesSpaceX 'BFR' Could Deliver Superfast Travel on Earth
-
06:47
SpaceX 'BFR' Spaceship to Mars in 2022? - Elon Musk Explains
Added 619 Views / 0 LikesSpaceX 'BFR' Spaceship to Mars in 2022? - Elon Musk Explains
-
01:23
SpaceX 'BFR' Spaceship to the Moon - Elon Musk Explains
Added 570 Views / 1 LikesSpaceX 'BFR' Spaceship to the Moon - Elon Musk Explains
-
03:12
Mars Lander and Orbiting ‘Base Camp’ Visualized by Lockheed Martin
Added 565 Views / 0 LikesMars Lander and Orbiting ‘Base Camp’ Visualized by Lockheed Martin
-
13:38
Future Tropical Storms & Hurricanes NATE* 48* hours & OPHELIA* 1* week
Added 572 Views / 0 LikesFuture Tropical Storms & Hurricanes NATE* 48* hours & OPHELIA* 1* week
-
09:23
NASA delays the Hubble Telescope Replacement JWST AGAIN!
Added 527 Views / 0 LikesNASA delays the Hubble Telescope Replacement JWST AGAIN!
-
04:01
Where is NASA's New Horizons? It's Exploring - More Pluto and New Target News
Added 528 Views / 0 LikesWhere is NASA's New Horizons? It's Exploring - More Pluto and New Target News
-
06:47
Puerto Rico needs more & better HELP NOW to avoid total catastrophe!
Added 589 Views / 0 LikesPuerto Rico needs more & better HELP NOW to avoid total catastrophe!
-
03:39
Europe! Prepare for Wave after Wave after Wave of Big Bad Storms
Added 638 Views / 0 LikesEurope! Prepare for Wave after Wave after Wave of Big Bad Storms
-
26:49
THORnews Hard Truth - Puerto Rico, Tropical Storm Nate & $-20 Trillion
Added 579 Views / 0 LikesTHORnews Hard Truth - Puerto Rico, Tropical Storm Nate & $-20 Trillion
-
01:02
Animation: Black Hole Merger That Created 4th Gravitational Waves Detection
Added 705 Views / 1 LikesAnimation: Black Hole Merger That Created 4th Gravitational Waves Detection
-
02:32
Dangerous Space Radiation Poses Threat to Mars Mission Astronauts - NASA Explains
Added 551 Views / 0 LikesDangerous Space Radiation Poses Threat to Mars Mission Astronauts - NASA Explains
-
00:59
'Exotic Ice Formations' On Pluto Discovered Using New Horizons' Imagery
Added 554 Views / 0 Likes'Exotic Ice Formations' On Pluto Discovered Using New Horizons' Imagery
-
09:39
USA and Puerto Rico = the FUTURE = Hell & Hurricanes or a New Way?
Added 554 Views / 0 LikesUSA and Puerto Rico = the FUTURE = Hell & Hurricanes or a New Way?
-
25:15
Hurricane Maria confessional & Deterioration of Society over compensation.
Added 360 Views / 0 LikesHurricane Maria confessional & Deterioration of Society over compensation.
-
17:38
Hurricane Maria & Lee moving NxNW - NC & EAST COAST = STAY AWARE
Added 540 Views / 0 LikesHurricane Maria & Lee moving NxNW - NC & EAST COAST = STAY AWARE
-
1:17:32
NASA's Innovative Advanced Concepts
Added 445 Views / 0 LikesNASA's Innovative Advanced Concepts
-
08:40
NASA's Innovative Advanced Concepts
Added 477 Views / 1 LikesNASA's Innovative Advanced Concepts
-
15:30
NC Evacuations begin as Hurricane Maria absorbs Jose & High P bridges
Added 483 Views / 0 LikesNC Evacuations begin as Hurricane Maria absorbs Jose & High P bridges