Astronomy milestones: Early 90’s

Black_hole2

1905 Einstein’s Special Theory of Relativity first proposed

1908 Giant and dwarf stars described

1923 Galaxies beyond the Milky way proved

1927 Big Bang theory proposed

1930 Pluto discovered by Clyde Tombaugh

1959 First photographs of the far side of the Moon by Soviet satellite Luna3

1961 First quasars discovered

1967 First pulsars identified

1971 Black hole first detected

1971 Mariner 9 spacecraft maps Mars

1973 Skylab space laboratory launched

1976 Rings of Uranus are discovered

1977 Voyager deep space probes are launched

1980 Voyager 1 explores Saturn

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Names of months

The names of the months in English (as well in many other languages) come from Latin Words. January Januarius – this month was dedicated to Janus, the Roman god of doors. Janus had two faces, one looking back at the old year and the other looking forward to the new year. February Februarius – Februa was the Roman purification festival, which took place at this time of year. March ...

Chinese calendar

Present-day China uses the Gregorian calendar for most purposes, but traditional festivals, such as Chinese New Year, take place according to the ancient Chinese calendar. Legend has it that this was started during the reign of Emperor Huangdi in 2637 BC, and relates to the positions of the Moon and Sun. Heavenly systems Earthly branches 1 jia 1 zi (rat) 2 yi ...

Constellations

Groups of stars form patterns in the night sky, which are called constellations. There are 88 known constellations. The sumerians, a Middle Eastern civilization, probably named them, about 5,000 years ago. The largest is Hydra, the sea serpent, and the smallest is Crux Australis, the Southern Cross. Centaurus, the Centaur. Has the most stars that can be seen with the naked eye(94). Others include Aquila, the Eagle; Canis Major, the Great Dog; and Orion, the Hunter.

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