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- Dictionaryouter space/ˌaʊtə ˈspeɪs/
noun
- 1. the physical universe beyond the earth's atmosphere.
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Being essentially empty, outer space allows the earliest (redder) galaxies to be viewed without obstruction, as in the Webb's First Deep Field image. Outer space (or simply space) is the expanse that exists beyond Earth's atmosphere and between celestial bodies.
- 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' begins about 100 km above the Earth, where the shell of air around our planet disappears. With no air to scatter sunlight and produce a blue sky, space appears as a black blanket dotted with stars.
Dec 28, 2022 · Outer space is what lies beyond the Earth's atmosphere, where orbital dynamics have a greater influence than aerodynamics. Learn how the Kármán Line is used to define the edge of space, and how far we have traveled into the vastness of the cosmos.
The universe is everything, including space, time, matter and energy. Learn how old the universe is, how it began, what it is made of and how it will end.
May 24, 2023 · The term outer space refers to anything beyond Earth, even things very close to home in low-Earth orbit, which begins as low as 100 miles (160 kilometers) above the planet.
9 hours ago · NASA images: These 6 photos from outer Space will make you fall in love with astronomy. NASA images: The US space agency shares images clicked from outer space. At times, the images have been ...
