03-01-2018, 04:29 PM
METEORS
*A bright streak of light in the sky
Ans : Meteors
*Meteors are also known as Shooting star/ Falling star
*Meteors may bum up or fall on earth in the form of dust or fragments called Meteroites
COMETS
*The mixture of ices (both water & frozen gases) and dust revolve around the sun in elongated orbits
Ans : Comet
*The first astronomer who discovered the proper motion of stars and periodicity of comets
Ans : Halley
*Halley’s comet is seen in every 76 years
*It was last seen in 1986. It will reappear in 2062.
*The tail of comets appear due to the phenomenon
Ans : Tyndall effect
ASTEROIDS
*The irregular objects mostly found between the orbit of Jupiter and Mars
Ans : Asteroids
*The first discovered Asteroid
Ans : Ceres
*The biggest Asteroid in the solar system was
Ans : Ceres
SOLAR SYSTEM
*The centre of the solar system
Ans : Sun (it is the largest body in the solar system)
*The time taken by the solar system to make a rotation around the milky way
Ans : Cosmic Year (1 Cosmic year - 25 crore years)
*The age of the sun
Ans : approximately 460 million years
*The most abundant element in the solar system
Ans : Hydrogen
*The heat and light in the sun is formed by the process of
Ans : Nuclear Fusion
*Heat and light from the sun reaches Earth by
Ans : Radiation
*Sunburn is due to the radiation of
Ans : Ultraviolet
*The time taken by the sunlight to reach the earth
Ans : 500 seconds (8 Minute 20 Seconds)
*The layers of sun
Ans : Core, Photosphere, Chromosphere and Corona
*The temperature of the core
Ans : 15 million C
Distance Measurement
*The distance between the sun and planets are measured by
Ans : Astronomical Unit (A.U.)
*Astronomical unit
Ans : The approximate distance between earth and sun (15 crore km)
*The unit to measure the distance between stars
Ans : light year (It is the distance of the light travels in one year at a speed of 3,00,000 km/sec)
*The unit to measure the distance between two galaxies
Ans : Parsec (One Parsec = 3.26 light year)
*The glowing surface of the sun
Ans : Photosphere (it is the lower atmosphere of the sun)
*The visible part of the sun
Ans : Photosphere (it emits light at visible wave lengths)
*The comparatively cool regions on the photosphere
Ans : Sunspots
*The outer layer of the sun
Ans : Corona (It experience the temperature about one million °C)
*Sun exists in - Plasma state
*The magnetic field of the sun
Ans : Magnetosphere (Heliosphere) (147.1 million km)
*The earth is closest to the sun on
Ans : 3rd January (Perihelion) (152.6 million km)
*The earth is farthest away from sun on
Ans : 4th JuIy(Aphelion)
*The international organisation naming celestial bodies - International Astronomical Union
*Solar eclipse occurs at
Ans : New Moon (It happens when the moon comes between the earth and sun)
*The only part of the sun visible during total solar eclipse
Ans : Corona
PLANETS
*The planets are the celestial bodies revolving around the sun.
*The definite path along with the planets revolve around the sun
Ans : Orbit
*Orbits of the planets around the sun are
Ans : Elliptical
*There are 8 known planets in the solar system
Ans : Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune
*The greek word ‘Planet' means ‘wandering star'.
*Inner (Terrestrial) planets
Ans : Mercury, Venus, Earth and Mars
*Earth is the largest of inner planets.
*Outer planets have lower densities compared to that of inner planets,
*Outer plants - Jupiter, Saturn, Uranus and Neptune
