Tag: sky vision

Quizzes (18) Questions (7)

Questions Related to sky vision

Multiple choice physics sky vision types of galaxies galaxies constellations

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 $= 9.5 \times 10 ^ { 15 } \mathrm { m }$ 

  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 $3 \times 10 ^ { 37 } \mathrm { kg }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using the formula for orbital velocity v = sqrt(GM/r), where r is the radius (half the diameter) and v is the speed, we can solve for M. Given diameter = 15 light years (r = 7.5 light years), v = 200,000 m/s, and the constants, the calculation yields approximately 4.3 x 10^37 kg.

Multiple choice physics sky vision types of galaxies galaxies constellations

The nearest galaxy to the Milky Way is _________.

  1. Fornax galaxy

  2. Samprero galaxy

  3. Andromeda galaxy

  4. Pinwheel galaxy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Andromeda Galaxy is the nearest major spiral galaxy to our own Milky Way galaxy.

Multiple choice physics sky vision types of galaxies galaxies constellations

The stars in space are _________________.

  1. uniformly spread out.

  2. distributed completely at random

  3. mostly contained within widely separated galaxies

  4. chiefly in the Milky Way
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

Answer is $C$

Multiple choice physics sky vision types of galaxies galaxies constellations

The Milky Way is ________________.

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

Answer is $C$

Multiple choice physics sky vision types of galaxies galaxies constellations

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

  1. local group

  2. big bang group

  3. temperate group

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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


Multiple choice physics sky vision types of galaxies galaxies constellations

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.