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Celestial bodies
Celestial bodies

... Solstice- day when the sun is farthest North of South of the equator Winter Solstice- Dec 21/22 Summer Solstice- June 21/22 Equinox- time when the sun is directly above the equator Vernal (Spring) Equinox-March 21/22 Autumnal (Fall) Equinox-Sept 21/22 Celestial bodies-objects in space: asteroid, pla ...
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... *The band of stars are called milky way. * An island of stars spinning through space is called galaxy. *There are many other galaxies in space. *Bodies that go around the sun are called planets. *Plants go round the sun in fixed paths called orbits. *The earth has one moon. *The sun and all the plan ...
THE PHOTOSPHERE IS THE VISIBLE SURFACE OF THE SUN
THE PHOTOSPHERE IS THE VISIBLE SURFACE OF THE SUN

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Heliosphere



The heliosphere is the bubble-like region of space dominated by the Sun, which extends far beyond the orbit of Pluto. Plasma ""blown"" out from the Sun, known as the solar wind, creates and maintains this bubble against the outside pressure of the interstellar medium, the hydrogen and helium gas that permeates the Milky Way Galaxy. The solar wind flows outward from the Sun until encountering the termination shock, where motion slows abruptly. The Voyager spacecraft have actively explored the outer reaches of the heliosphere, passing through the shock and entering the heliosheath, a transitional region which is in turn bounded by the outermost edge of the heliosphere, called the heliopause. The overall shape of the heliosphere is controlled by the interstellar medium, through which it is traveling, as well as the Sun, and does not appear to be perfectly spherical. The limited data available and unexplored nature of these structures have resulted in many theories.On September 12, 2013, NASA announced that Voyager 1 had exited the heliosphere on August 25, 2012, when it measured a sudden increase in plasma density of about forty times. Because the heliopause marks one boundary between the Sun's solar wind and the rest of the galaxy, a spacecraft such as Voyager 1 which has departed the heliosphere can be said to have reached interstellar space.
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