﻿ Our Universe, Solar System with detail information

Universe at a glance ......


★ The Sun is a star that is in the center of the Solar System.

★ The Sun is recognized as having the largest mass in our Solar System.

★ It has a diameter of about 1,392,684 km, about 109 times that of Earth.

★ The sun is the closest star to Earth, at a mean distance from our planet of 149.60 million km.Sun

★ Sun fuses 620 million metric tons of hydrogen each second.


★ In February 1974, Skylab was the first manned spacecraft to study the Sun.


★ Solar flares produce bursts of electromagnetic radiation, x-rays, ultraviolet radiation, visible light, and radio waves.


★ Mercury is the closest and second smallest in the Solar System.Mercury

★ Mercury is the second densest planet after Earth.



★ Galileo first observed Mercury during the 17th century.


★ Venus is the second closest and sixth largest planet in the Solar System.

★ The orbital speed of Venus is 35 km per second.Venus

★ Venus is the hottest planet in the Solar System.

★ Venus appears to be the brightest planet in the sky.

★ It takes 244.7 days for Venus to rotate on its axis.




★ The Earth is the densest planet in the Solar System. Earth

★ Earth is the fifth largest planet in the Solar System.

★ The Diameter of the Earth is 12,756 km (7,926 miles).

★ The earth’s orbital speed is 29.8 km per second.


★ Earth rotates about its own axis 366.26 times, creating 365.26 solar days.


★ The Moon is Earth’s lone natural satellite.

★ In 1610, Galileo Galilei is the first to use a telescope to make scientific observations of the Moon.Moon

★ The Moon is the fifth largest satellite in our Solar System.

★ The Moon’s diameter is 2160 miles (3476 km).


★ The Moon’s gravity is 1/6 that of Earth.

★ The Moon does not have an atmosphere; there is no wind on the Moon.

★ Apollo 11 was the American space mission to first reach and land on the moon.

★ The first human landing on the Moon was on 20 July 1969.

★ The Moon orbits around the Earth every 29 days.



★ Iron oxide prevalent on its surface gives it a reddish appearance, often described as “ Red Planet”.Mars

★ A Mars year is equal to 686.98 Earth Days.

★ A day in Mars is equal to 24.6 Earth Hours.

★ Like Earth, Mars experiences seasons because of the tilt of its rotational axis.





★ Jupiter, the largest planet in our solar system, is 318 times larger than Earth.Jupitar

★ The orbital speed of Jupiter is 13.1 km/sec.

★ A year on Jupiter is equal to 11.9 Earth Years.

★ Jupiter has 67 natural satellites.[105] Of these, 51 are less than 10 kilometres in diameter and have only been discovered since 1975.

★ Galileo Galilei had discovered Jupiter's four largest moons, now called Io, Europa, Ganymede, and Callisto. These four moons are known today as the Galilean satellites.

★ In 1610, Galileo Galilei makes the first detailed observations of Jupiter.

★ Jupiter's moon Ganymede is the biggest satellite in solar system.



★ Jupiter’s rings were discovered by Voyager 1 in 1979.


★ Saturn is the sixth planet from the Sun and the second largest.Saturn

★ Saturn has 62 known moons, fifty-three have been named. Most of them are small in size.

★ Names of some of Saturn’s moons: the largest is Titan, discovered in 1655; Tethys, Dione, Rhea, & Iapetus, discovered from 1671 to 1672; Mimas & Enceladus, discovered in 1789; and Hyperion, discovered in 1848.

★ A year on Saturn is equal to 29.5 Earth Years.

★ Pioneer 11 is the first spacecraft to reach Saturn, in 1979.



★ The orbital speed of Uranus is 6.6 km/sec.Uranus

★ Uranus takes 84 Earth years to complete one orbit.

★ Uranus is the third largest planet in the Solar System.

★ Voyager 2, the only spacecraft to visit Uranus.

★ A day on Uranus is equal to a little more than 17 hours on Earth.


★ Uranus was discovered by Sir William Herschel in 1781.


★ Neptune is the fourth largest planet and coolest planet in the Solar System.



★ The only spacecraft ever to visit Neptune was Voyager 2 in 1989.Neptune

★ The magnetic field of Neptune is about 27 times more powerful than that of Earth.

★ One Neptune year is equal to 164.83 Earth Years.

★ Neptune has six known rings.

★ In 2011, Neptune completes its first 165-year orbit of the sun since its discovery in 1846.

★ Neptune has 13 moons, the largest of which is named Triton. The other moons are: Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, Nereid, Halimede, Sao, Laomedeia, Neso, and Psamathe.


★ Pluto is the smallest planet in the Solar System, now consider as dwarf planet.Pluto

★ Pluto is colder than Neptune.

★ Pluto’s journey around the Sun takes 248 Earth years.

★ Pluto is the second most contrast body in the Solar System.

★ Pluto has not yet been visited by a spacecraft.

★ Pluto has a satellite, Charon, which was discovered (in 1978). The distance between them is 19,640 km (12,200 miles).The other 3 are Nix, Hydra, and newly discovered S/2011 P 1 on July of 2011.


★ Pluto was discovered by Tombaugh in 1930.

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