Physics · Science General

Astronomy and Cosmology

4,498 Questions

This topic provides questions on astronomy, cosmology, and the physical universe. It covers subjects like the Hubble sequence, constellations, dark matter, and stellar evolution. These questions help build a strong foundation for general science exam sections.

Galaxies and clustersConstellations and starsStellar evolutionSpace observatories

Astronomy and Cosmology Questions

Multiple choice

Which of the following could replace 'tremble' as used in the passage?

Directions: Read the following passage carefully and select the most suitable option according to the corresponding number in the passage.
A star is a heavenly (1) body which shines by its own light. Planets, as you know, shine only by light reflected (2) from the sun. The planets shine with a steady (3) light and the stars twinkle. This twinkling is caused by desturbances (4) in the air between the star and the earth. The unsteady air bends the light from the star, which then appears to tremble (5). Stars differ greatly (6) in size, density and temperature. At one end (7), there are stars called “red super-giants,” which are many times (8) larger than our sun (which is also a star). At the other end, there are stars called “white dwarfs,” some of which are about the size of our earth.

  1. vibrate

  2. shiver

  3. flicker

  4. twinkle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the unsteady air bends the light from the star, they seem to twinkle. The twinkling of stars is a very well known phenomenon.

Multiple choice

A meteor is

  1. a rapidly moving star

  2. a piece of matter which has entered Earth's atmosphere from outer space

  3. part of a constellation

  4. a comet without a tail
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Meteor is a small celestial body which enters the Earth’s atmosphere due to the gravitational force of Earth. Meteors typically occur in the mesosphere.

Multiple choice

Starkiller Base ran on what dark energy?

  1. Hosnian Power

  2. Enterprise

  3. Quintessence

  4. Dark Kyber Force
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Starkiller Base was powered by harvesting 'quintessence', a form of dark energy, from the core of the planet Ilum.

Multiple choice

What are baby stars called?

  1. Nebula

  2. Protostar

  3. Supernova

  4. Constellation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A protostar is a young, developing star that is still gathering mass from its parent molecular cloud. It represents the early stage of stellar evolution.

Multiple choice

What are the gas/dust clouds that form stars?

  1. Nebula

  2. Protostar

  3. Supernova

  4. Constellation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A nebula is an enormous cloud of dust and gas in space that serves as the nursery where new stars are born. Gravity causes these clouds to collapse and form stars.

Multiple choice

What is a pattern of stars called?

  1. Nebula

  2. Protostar

  3. Supernova

  4. Constellation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A constellation is a group of stars that forms an imaginary outline or pattern on the celestial sphere. These patterns are often named after mythological figures or objects.

Multiple choice

Which color of star is the coolest?

  1. Blue

  2. Red

  3. White

  4. Yellow
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In stellar classification, surface temperature correlates with color. Red stars are the coolest, while blue stars are the hottest.

Multiple choice

Why are other stars so small?

  1. They are so small

  2. They're so far away

  3. The sun is huuuge
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stars appear small in the night sky because they are at immense distances from Earth. Even though many are much larger than the Sun, their distance makes them appear as mere points of light.

Multiple choice

Is our sun the biggest star in the sky?

  1. yes

  2. no
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There are many stars in the universe, such as UY Scuti or Betelgeuse, that are significantly larger than our sun. The sun is only the biggest star from our perspective because it is the closest one to Earth.

Multiple choice

How many stars are in our solar system?

  1. 0

  2. 1

  3. thousands

  4. billions
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Our solar system is defined by the sun, which is the only star within it. Other stars are located in different solar systems or galaxies.