Meet our new cosmic mapmaker! A new space telescope called the Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer, or SPHEREx, will scan the entire sky in infrared light every six months. This data will be used to create an enormous database of stars, galaxies, nebulae, and other objects. SPHEREx data will help study the early expansion of the universe, systems where planets are likely to form, and the history of galaxies. Though our recently launched NAS
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6.8K views · 77 reactions | Look inside a lab! Today, it’s one sphere...
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A photon sphere is a location where gravity is so strong that light can travel in circles. Photons orbit the black hole at the distance of the photon sphere. A photon could leave the back of your head, go once around the black hole, and be seen by your eye - you can see the back of your head. | Science Queries 360
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• The Calm Photosphere and the Active Chromosphere • The photosphere is the visible "surface" of the Sun. The name means "sphere of light". From this thin layer - which is only about 300 km deep - most of the Sun's energy is emitted in the form of visible and infrared radiation. It is particularly well visible in white light or in the light of the ionized calcium (the spectral K-line). The temperature in the photosphere decreases steadily from about 6400 degrees at the base to about 4400 degrees
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