The aggregate of all existing things or the whole creation including all celestial bodies(heavenly bodies) and all of the space is called universe.The earth, the sun, the moon, etc whatever we see around us are in the universe.
It is defined as the distance traveled by the light in one year. Its value is about 9.5 x 1015 m
or 63066 AV. The sun takes 2.5*1018 years to revolve around the galactic center. This time is called cosmic year.
It is defined as the distance between the sun and the earth and its value is about 1.5 x 1011. This unit is suitable for measuring the distance of the planets and satellites in the solar system 1AU = 1.5 x 1011. The diameter of the solar system is about 78.1 AU.
The huge space which contains everything (all types of heavenly bodies including earth) is called the universe.
The distance travelled by light in a year is called one light year. One light year equals 9.5×1012 km. The distances between the heavenly bodies are so great that they cannot be measured in km. so, light year is used to measure the distances between heavenly bodies.
The distance between the heavenly bodies are measured in astronomical units. The distance between the sun and the earth is 150,00,00,00 km and it is taken as 1 A.U. In a similar way, the distance between the sun and Pluto is 39 A.U.
Our current universe is 13.8 billion light years old.
Light year defined as the distance traveled by the light in ______.
How many year sun takes to revolve around the galactic center?
Astronomical unit is defined as the distance between the ______.
sun and the earth
earth and the moon
sun and all planet
none of these
The diameter of the solar system is about ______.
Astronomical unit is suitable for measuring the distance of the ______ in the solar system.