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Heliophysics (from the prefix "helio", from Attic Greek hḗlios, meaning Sun, and the noun "physics": the science of matter and energy and their interactions) is the physics of the Sun and its connection with the Solar System. [1]
The adjectival forms of the names of astronomical bodies are not always easily predictable. Attested adjectival forms of the larger bodies are listed below, along with the two small Martian moons; in some cases they are accompanied by their demonymic equivalents, which denote hypothetical inhabitants of these bodies.
Tabloid – SUN, RAG; Take — R (from Latin recipe, meaning "take") Tar – AB (able seaman) Tax – VAT (value added tax) Teacher – DON, B ED (Bachelor of Education) Teachers – NUT (National Union of Teachers) Team – XI (Roman numerals for eleven players in a football or cricket team) Teetotal – TT or AA (from Alcoholics Anonymous)
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Pulsars such as PSR J0737-3039, are designated with a "PSR" prefix, that stands for Pulsating Source of Radio. The prefix is followed by the pulsar's right ascension and degrees of declination. The right ascension is also prefixed with a "J" (Julian epoch) or a "B" (Besselian Epochs) used prior to 1993, as in PSR B1257+12.
The Sun is 1.4 million kilometers (4.643 light-seconds) wide, about 109 times wider than Earth, or four times the Lunar distance, and contains 99.86% of all Solar System mass. The Sun is a G-type main-sequence star that makes up about 99.86% of the mass of the Solar System. [26]
The helio-prefix is derived from the Greek word "ἥλιος", meaning "Sun", and also Helios, the personification of the Sun in Greek mythology. [1] The first spacecraft to be put in a heliocentric orbit was Luna 1 in 1959. An incorrectly timed upper-stage burn caused it to miss its planned impact on the Moon. [2]
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