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  2. List of unsolved problems in astronomy - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Axis of evil: Some large features of the microwave sky at distances of over 13 billion light-years appear to be aligned with both the motion and orientation of the solar system. Is this due to systematic errors in processing, contamination of results by local effects, or an unexplained violation of the Copernican principle ?

  3. Category:Solar phenomena - Wikipedia

    en.wikipedia.org/wiki/Category:Solar_phenomena

    Print/export Download as PDF; Printable version; In other projects ... Pages in category "Solar phenomena" The following 81 pages are in this category, out of 81 ...

  4. Heliophysics - Wikipedia

    en.wikipedia.org/wiki/Heliophysics

    NASA defines [2] heliophysics as "(1) the comprehensive new term for the science of the Sun - Solar System Connection, (2) the exploration, discovery, and understanding of Earth's space environment, and (3) the system science that unites all of the linked phenomena in the region of the cosmos influenced by a star like our Sun."

  5. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    The Milky Way [c] is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.

  6. Solar phenomena - Wikipedia

    en.wikipedia.org/wiki/Solar_phenomena

    Space weather is the environmental condition within the Solar System, including the solar wind. It is studied especially surrounding the Earth, including conditions from the magnetosphere to the ionosphere and thermosphere. Space weather is distinct from terrestrial weather of the troposphere and stratosphere. The term was not used until the 1990s.

  7. Solar System - Wikipedia

    en.wikipedia.org/wiki/Solar_System

    The Solar System remains in a relatively stable, slowly evolving state by following isolated, gravitationally bound orbits around the Sun. [28] Although the Solar System has been fairly stable for billions of years, it is technically chaotic, and may eventually be disrupted. There is a small chance that another star will pass through the Solar ...

  8. Heliosphere - Wikipedia

    en.wikipedia.org/wiki/Heliosphere

    The solar wind is traveling at supersonic speeds within the Solar System. At the termination shock, a standing shock wave , the solar wind falls below the speed of sound and becomes subsonic . It was previously thought that once subsonic, the solar wind would be shaped by the ambient flow of the interstellar medium, forming a blunt nose on one ...

  9. Apparent retrograde motion - Wikipedia

    en.wikipedia.org/wiki/Apparent_retrograde_motion

    In the geocentric model of the Solar System proposed by Apollonius in the third century BCE, retrograde motion was explained by having the planets travel in deferents and epicycles. [4] It was not understood to be an illusion until the time of Copernicus , although the Greek astronomer Aristarchus in 240 BCE proposed a heliocentric model for ...

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