Sun and the Moon~ on ~ 0 comments
Sun: The center of solar system is Sun. The members of solar system include planets, their satellites, comets, interplanetary gas, asteroids, and dust. There are eight planets in the solar system. Pluto was earlier included in the list of planets, but later withdrew from planet list in 2006 August 24. The energy source of solar system is sun. Hydrogen is the most abundant element in sun. Helium is the second most abundant element. The state of sun is Plasma. One can see the sun from earth in Photosphere. The surface temperature of sun is 5500 degree Celsius. The age of sun is around 950 crore years. The solar wind is said to be occurred once in 11 years. The sun needs around 226 million years to rotate the centre of Milky Way. It is called a cosmic year. In Sun, Nuclear Fusion process is happening, where Hydrogen atoms combines to form Helium. The nearest star of earth is Sun. But the nearest star of Solar System is Proxima Centauri. Sirius is the brightest star next to sun in sky.
Moon: The fifth biggest satellite is Moon. 59 percent of moon can be seen from earth. The weight of 60 kg object in earth is only 6 kg in moon. Moon needs 27 days, 7 hours and 43 minutes to rotate the earth. Selenology is the branch that deals with the study of Moon. Black is the color of sky in Moon, because Moon has no atmosphere. 3,84,403 kilometer is the average distance of moon from sun. Human landed Moon for first time in 1969, July 21. Neil Armstrong landed moon for first time and Edwin Aldrin landed moon secondly. Apollo 11 is the space vehicle used by Neil for his voyage. 12 peoples landed moon till now. A blue moon is a second full moon in a month.