Question

Match the columns.

Column 1	Column 2
The dust and gas clouds in isolated space.	galaxy
Distance from the sun to the earth.	cosmic year
Vast collection of billions of stars and gas clouds in an isolated space	nebulae
The nearest galaxy visible to the naked eye	moon
The time in which a galaxy revolves around its center.	astronomic unit
The heavenly bodies radiate out heat and light energy.	andromeda
The heavenly bodies revolve around the planet.	stars
A star-like body having a long tail	plutons
Planets like objects revolving around the sun beyond neptune.	venus
A planet having the largest axial rotation period.	comet

Answer 1

Part 01:

1. The dust and gas clouds in isolated space are called nebulae.
2. Nebulae are made up of hydrogen gas and are also called the birthplace of stars.
3. Thus, (A)-(III)

Part 02:

1. Distance from the sun to the earth is called one astronomic unit (AU)
2. Thus, (B)-(V)

Part 03:

1. The vast collection of billions of stars and gas clouds in an isolated space – galaxy
2. One such galaxy is the milky way which is our home to the sun and solar system.
3. Thus, (C)-(I)

Part 04:

1. The nearest galaxy visible to the naked eye- the Andromeda galaxy
2. It is 2.5 million light-years away from the earth.
3. Thus, (D)- (VI)

Part 05:

1. The time in which a galaxy revolves around its center-cosmic year
2. For example, the milky way takes 225 x 10⁶ years to complete one revolution around its center.
3. Thus, (E)-(II)

Part 06:

1. The heavenly bodies radiate out heat and light energy- stars.
2. Stars are made up of hydrogen and use nuclear fusion to produce heat and light.
3. Thus, (F)-(VII)

Part 07:

1. The heavenly bodies revolve around the planet – a natural satellite
2. For example, the moon is the natural satellite of the earth.
3. Thus, (G)-(IV)

Part 08:

1. A star-like body having a long tail- a comet.
2. Comets are made up of Ice, dust, and rocky materials.
3. Comets revolve around the sun in a highly elongated orbit.
4. When a comet approaches the Sun, due to heat from the sun ice melts.
5. Melting ice along with dust and other material sweeps into a long tail. Hence the name “puchchal tara”
6. Thus, (H)-(X)

Part 09:

1. Planets like objects revolving around the sun beyond Neptune- Plutons
2. For example, Pluto, Xena, and Charon are called plutons.
3. Thus, (I)-(VIII)

Part 10:

1. A planet has the largest axial rotation period.- Venus
2. It takes 243 days to complete one axial rotation.
3. Thus,(J)-(IX)

Hence, (A)-(III), (B)-(V), (C)-(I), (D)- (VI), (E)-(II), (F)-(VII), (G)-(IV), (H)-(X), (I)-(VIII), (J)-(IX).