Question 42 of 64 · Universe & Solar System
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The nearest large spiral galaxy to the Milky Way is the:

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Answer: Option A — Andromeda Galaxy

Detailed Solution

The Andromeda Galaxy (also called Messier 31, or M31) is the nearest large spiral galaxy to our own Milky Way, at a distance of about 2.5 million light-years.

Key facts about the Andromeda Galaxy:

  • It lies in the direction of the constellation Andromeda.
  • It is the most distant object that can be seen with the naked eye from dark places, appearing as a faint, fuzzy patch.
  • It is about 2,20,000 light-years across, larger than the Milky Way.
  • It contains about one trillion stars.

Proof that it is a separate galaxy:

For centuries, it was thought to be a cloud of gas within our own galaxy.

In the 1920s, Edwin Hubble identified special stars called Cepheid variables in it and measured its distance. This showed that it lies far outside the Milky Way, proving that other galaxies exist.

Future collision:

The Andromeda Galaxy is moving towards the Milky Way at about 110 km per second.

Earlier studies predicted a collision in about 4 to 5 billion years. Recent studies suggest that the chance of a collision within the next 10 billion years is about 50 percent.

The Local Group:

The Milky Way, the Andromeda Galaxy and the Triangulum Galaxy are the three largest members of a group of more than 50 galaxies, called the Local Group.

About the Milky Way:

  • It is a barred spiral galaxy about 1,00,000 light-years across.
  • It contains 100 to 400 billion stars.
  • Its central region contains a supermassive black hole called Sagittarius A*.

The Milky Way's name comes from its appearance as a milky band of light across the night sky. In India, it is called Akash Ganga.

Why not the other options?

  • ✗The Large Magellanic Cloud is a nearby satellite galaxy of the Milky Way, but it is an irregular dwarf galaxy, not a large spiral.
  • ✗The Whirlpool and Sombrero galaxies are spiral galaxies, but much farther away.

Quick tip

Remember: Nearest large spiral galaxy = Andromeda (M31), about 2.5 million light-years away; part of the Local Group with the Milky Way.

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Universe & Solar System — Preparation

This question tests your understanding of Universe & Solar System, a key topic in the General Knowledge section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.

This topic covers the universe, galaxies and stars, the solar system and its planets, dwarf planets, moons, asteroids, comets and meteors, and the Earth's motions, including rotation, revolution, seasons, latitudes, longitudes and time zones. Common questions ask about the largest and smallest planets (Jupiter and Mercury), the hottest planet (Venus), the 'Red Planet' (Mars), and planets with the most moons. Other frequent questions cover solstices and equinoxes, the International Date Line, and Indian Standard Time, which is based on the 82.5 degree E meridian. Practise the universe and solar system questions below, written in the style of the general awareness sections of exams such as SSC, banking, railways, CUET GAT, MAH CET and CLAT. Each question comes with a detailed explanation that adds related facts, so every question helps you revise more than one point.