## Note on Introduction to Universe

• Note
• Things to remember
• Videos
• Exercise
• Quiz

### Universe

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.

#### Light year

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.

#### Astronomical unit

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 aggregate of all existing things or the whole creation including all celestial bodies(heavenly bodies) and all of the space is called universe.
• Light year is defined as the distance traveled by the light in one year.
• The sun takes 2.5 x 1018 years to revolve around the galactic center.
• The diameter of the solar system is about 78.1 AU.
• The value of astronomical unit is about 1.5 x 1011.
.

### Very Short Questions

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.

0%

one year

hundred year

one day

ten year

• ### How many year sun takes to revolve around the galactic center?

2.5×1018 year

100 year

1 year

2×1018 year

• ### Astronomical unit is defined as the distance between the ______.

earth and the moon

sun and all planet

none of these

sun and the earth

70.1 AU

77.7 AU

78 AU

78.1 AU

• ### Astronomical unit is suitable for measuring the distance of the ______ in the solar system.

planets and satellites
sun and all planet
sun and the earth
earth and the moon
• ## You scored /5

Forum Time Replies Report
##### No name

Even this universe is made of simple atom...Why things differ and why some were living being and other are Non living being...If it was from the same atom?? Pardon for grammers

##### Sushant Acharya

What is the mass and density of black hole?

##### pratikgya

what is big bang theory?