Tag: sky vision

Questions Related to sky vision

Astronomers have observed a small massive object at the centre of our Milky Way galaxy. A ringof material orbits this massive object; the ring has a diameter of about 15 light years and an orbital  speed of 200$\mathrm { km } / \mathrm { s }$ . What is the mass of the massive object at the centre of the minky  Way? Given $G = 6.67 \times 10 ^ { - 11 } \mathrm { Nm } ^ { 2 } \mathrm { kg } ^ { 2 }$ and 1 light year $= 9.5 \times 10 ^ { 15 } \mathrm { m }$ 

physics sky vision types of galaxies galaxies constellations

  1. Approximately $8.1 \times 10 ^ { 37 } \mathrm { kg }$

  2. approximately $4.3 \times 10 ^ { 37 } \mathrm { kg }$

  3. Approximately $6 \times 10 ^ { 37 } \mathrm { kg }$

  4. approximately $3 \times 10 ^ { 37 } \mathrm { kg }$

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Correct Option: B

Milky way is _____ in shape.

physics sky vision types of galaxies galaxies constellations

  1. Elliptical

  2. Spiral

  3. Regular

  4. Circular

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Correct Option: B
Explanation:

Ans: Spiral 

The nearest galaxy to the Milky Way is _________.

physics sky vision types of galaxies galaxies constellations

  1. Fornax galaxy

  2. Samprero galaxy

  3. Andromeda galaxy

  4. Pinwheel galaxy

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Correct Option: C

The stars in space are _________________.

physics sky vision types of galaxies galaxies constellations

  1. uniformly spread out.

  2. distributed completely at random

  3. mostly contained within widely separated galaxies

  4. chiefly in the Milky Way

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Correct Option: C
Explanation:

Stars are not scattered randomly through space they are gathered together into vast groups also known as galaxies.

Answer is $C$

The Milky Way is ________________.

physics sky vision types of galaxies galaxies constellations

  1. a gas cloud in the solar system

  2. a gas cloud in the galaxy of which the sun is a member

  3. the galaxy of which the sun is a member

  4. a nearby galaxy

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Correct Option: C
Explanation:

Milky way is the galaxy which contains as our solar system hence it also contains sun.

Answer is $C$

Milky Way galaxy is in cluster of galaxies which is also known as:

physics sky vision types of galaxies galaxies constellations

  1. local group

  2. big bang group

  3. temperate group

  4. none of the above

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Correct Option: A
Explanation:

The milk way galaxy cluster is also known as the local supercluster as local group.


The visible light spectrum of a typical star like our Sun shows:

physics sky vision types of galaxies galaxies constellations

  1. bright emission lines

  2. shows all of the other answers depending on the season on Earth

  3. no spectral lines at all

  4. dark absorption lines

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Correct Option: D
Explanation:

They show dark absorption light which tells us about the temperature of star like oxide lines are there only in cool stars while hot stars show helium lines.