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Neither empty nor dark
- The reality is that space in neither empty nor dark. Even outside galaxies, an astronaut could find at least one proton, on average, in every cubic meter. Also, one electron and half a billion photons and neutrinos, all left over from the big bang. Still, one might naively imagine that the space in between these particles is empty.
www.scientificamerican.com/article/endless-creation-out-of-nothing/
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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. [1]
- 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...
Dec 12, 2020 · The reality is that space in neither empty nor dark. Even outside galaxies, an astronaut could find at least one proton, on average, in every cubic meter.
- Avi Loeb
Space, or outer space, is a vast, near-perfect vacuum largely devoid of matter. This vacuum contains very few particles compared with Earth's atmosphere. However, it's not entirely empty. Space is dotted with scattered matter called the interstellar medium, which includes hydrogen and helium atoms.
Nov 13, 2023 · Even though the density of interstellar space is billions of times lower than even our emptiest human-made vacuum chambers, it's not 100% percent empty.
- 1 min
- Paul Sutter
Nov 4, 2020 · SPACE-TIME is mostly empty. Though there are at least 100 billion galaxies – each home to around 100 billion stars – and lots of galactic dust, the universe is so vast that there are huge ...
Jun 21, 2021 · Scientists now consider it unlikely the universe has an end – a region where the galaxies stop or where there would be a barrier of some kind marking the end of space. But nobody knows for sure.
