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- DictionaryOut·er space/ˌoudər ˈspās/
noun
- 1. the physical universe beyond the earth's atmosphere.
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Outer space (or simply space) is the expanse beyond celestial bodies and their atmospheres. It contains ultra-low levels of particle densities, constituting a near-perfect vacuum of predominantly hydrogen and helium plasma, permeated by electromagnetic radiation, cosmic rays, neutrinos, magnetic fields and dust.
Learn the meaning of outer space as the region beyond the earth's atmosphere or the solar system. See examples of usage, word history, and related entries from the Merriam-Webster dictionary.
- Space Radiation Invisible to Human Eyes
- Dark Matter and Energy
- Black Holes
- Stars, Planets, Asteroids and Comets
- Galaxies and Quasars
The majority of space is relatively empty, with just stray bits of dust and gas floating around. This means that when humans send a probe to a distant planet or asteroid, the craft will not encounter "drag" in the same way that an airplane does as it sails through space. In fact, the vacuum environment in space and on the moon, is one reason why th...
There remain two giant mysteries about space: dark matter and dark energy. While scientists have provided extensive evidence for the existence of dark matter and dark energy, they are each still poorly understood as, so far, scientists cannot directly observe them and can only observe their effects. Roughly 80% of all of the mass in the universe is...
Smaller black holescan form from the gravitational collapse of a gigantic star, which forms a singularity from which nothing can escape — not even light, hence the name of the object. No one is quite sure what lies within a black hole, or what would happen to a person or object who fell into it – but research is ongoing. An example is gravitational...
Stars (like our own sun) are immense balls of gas that produce their own radiation. They can range from red supergiants to cooling white dwarfs that are the leftovers of supernovas, or star explosions that occur when a big one runs out of gas to burn. These explosions spread elements throughout the universe and are the reason that elements such as ...
Among the biggest cosmic structures we can see are galaxies, which essentially are vast collections of stars. Our own galaxy is called the Milky Way, and is considered a "barred spiral" shape. There are several types of galaxies, ranging from spiral to elliptical to irregular, and they can change as they come close to other objects or as stars with...
Outer space is the part of space that is very far away from Earth. Learn more about its meaning, usage, and related words and phrases from Cambridge Dictionary.
Outer space is the part of space that is very far away from Earth. Learn more about its meaning, usage, and related words and phrases from Cambridge Dictionary.
Dec 20, 2018 · Simple. Except, no one really knows where “air space” ends and “outer space” begins. That might sound trivial, but defining that boundary could matter for a variety of reasons—including,...
Outer space definition: space beyond the atmosphere of the earth.. See examples of OUTER SPACE used in a sentence.
