Milky Way Practice Questions
18 free Milky Way practice questions for the Static GK. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
In which spiral arm of the Milky Way is our Solar System located?
- A Perseus Arm
- B Scutum-Centaurus Arm
- C Sagittarius Arm
- D Orion-Cygnus Arm
Correct answer: Orion-Cygnus Arm
The Solar System is situated in the Orion Arm, also known as the Orion Spur. It is a minor spiral arm located between the two much larger Perseus and Sagittarius arms.
What is the name of the supermassive black hole located at the center of the Milky Way?
- A Sagittarius A*
- B Cygnus X-1 Black Hole
- C Messier 87
- D Ton 618
Correct answer: Sagittarius A*
Sagittarius A* (pronounced Sagittarius A-star) is the compact radio source at the Galactic Center. It is a supermassive black hole with a mass approximately 4 million times that of our Sun.
The Milky Way belongs to a cluster of galaxies known as the:
- A The Local Group
- B Virgo Cluster
- C Great Attractor
- D Hercules Cluster
Correct answer: The Local Group
The Milky Way is part of the Local Group, which contains more than 50 galaxies. Its largest members are the Andromeda Galaxy, the Milky Way, and the Triangulum Galaxy.
What is the estimated diameter of the Milky Way's visible stellar disk?
- A 1,000 to 2,000 light-years
- B 10,000 to 12,000 light-years
- C 1,000,000 to 2,000,000 light-years
- D 100,000 to 200,000 light-years
Correct answer: 100,000 to 200,000 light-years
While estimates vary with new data, the diameter of the Milky Way's disk is generally cited as being between 100,000 and 200,000 light-years. Recent studies suggest the stellar disk may be even larger than previously thought.
Which component of the Milky Way contains the oldest stars and globular clusters?
- A The Galactic Halo
- B The Galactic Disk
- C The Spiral Arms
- D The Central Bar
Correct answer: The Galactic Halo
The Galactic Halo is a large, spherical region surrounding the galaxy that contains ancient stars and globular clusters. These stars are among the oldest in the universe, having formed when the galaxy was very young.
The Milky Way is currently on a collision course with which neighboring galaxy?
- A Small Magellanic Cloud
- B Triangulum Galaxy
- C Andromeda Galaxy
- D Sombrero Galaxy
Correct answer: Andromeda Galaxy
The Andromeda Galaxy (M31) is moving toward the Milky Way at about 110 kilometers per second. The two galaxies are predicted to collide and merge into a single giant elliptical galaxy in about 4.5 billion years.
Most of the mass of the Milky Way is believed to consist of:
- A Stars and planets
- B Interstellar gas
- C Cosmic dust
- D Dark matter
Correct answer: Dark matter
Dark matter makes up about 90% of the Milky Way's total mass. While it does not emit or reflect light, its presence is inferred by its gravitational effects on the visible stars and gas.
The 'Great Rift' seen in the Milky Way from Earth is caused by:
- A A massive void of stars
- B Clouds of interstellar dust
- C The shadow of the moon
- D Effects of dark energy expansion
Correct answer: Clouds of interstellar dust
The Great Rift is a dark band that appears to split the bright band of the Milky Way in the night sky. It is actually a series of overlapping, dark molecular dust clouds that block the light from stars behind them.
What is the name of the two satellite dwarf galaxies that are visible from the Southern Hemisphere?
- A Castor and Pollux
- B Phobos and Deimos
- C Magellanic Clouds
- D Canis Major and Minor
Correct answer: Magellanic Clouds
The Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) are irregular dwarf galaxies that orbit the Milky Way. They are prominent features in the night sky of the Southern Hemisphere.
How far is the Sun from the Galactic Center?
- A 500 light-years
- B 8,000 light-years
- C 27,000 light-years
- D 100,000 light-years
Correct answer: 27,000 light-years
The Solar System is located roughly 26,000 to 28,000 light-years away from the center of the galaxy. We are situated about halfway between the center and the edge of the visible disk.
The term 'Milky Way' is a translation of which Latin phrase?
- A Via Lactea
- B Stella Maris
- C Terra Nova
- D Aqua Vitae
Correct answer: Via Lactea
Via Lactea is the Latin name for the Milky Way, which literally translates to 'road of milk'. The Greeks also called it 'Galaxias Kyklos' or 'milky circle'.
What kind of electromagnetic radiation is most useful for seeing through the dust to the Galactic Center?
- A Visible light
- B Ultraviolet rays
- C Infrared radiation
- D High-energy gamma rays
Correct answer: Infrared radiation
Interstellar dust scatters visible light, making the center of the galaxy invisible to standard optical telescopes. Infrared radiation has longer wavelengths that can pass through the dust, allowing astronomers to see the stars at the core.
The process by which the Milky Way grows by absorbing smaller galaxies is called:
- A Galactic Osmosis
- B Galactic Cannibalism
- C Stellar Mass Accretion
- D Nebular Drift
Correct answer: Galactic Cannibalism
Galactic cannibalism is the process of a large galaxy using its gravity to pull in and merge with a smaller neighbor. The Milky Way is currently 'eating' the Sagittarius Dwarf Spheroidal Galaxy.
What is the thickness of the Milky Way's stellar disk at the position of the Sun?
- A 10 light-years
- B 1,000 light-years
- C 10,000 light-years
- D 50,000 light-years
Correct answer: 1,000 light-years
The stellar disk of the Milky Way is relatively thin compared to its diameter. Near the Sun's location, the disk is approximately 1,000 light-years thick.
In ancient Indian astronomy, the Milky Way was known as:
- A Akash Ganga
- B Saptarishi Mandala
- C Brahmanda
- D Nakshatra
Correct answer: Akash Ganga
In Indian tradition, the Milky Way is known as Akash Ganga, which means the 'Ganges of the Sky'. It is seen as a celestial version of the sacred Ganges river.
The spherical distribution of stars surrounding the center of the galaxy is called the:
- A Galactic Outer Rim
- B Galactic Bulge
- C Galactic Tail
- D Galactic Spur
Correct answer: Galactic Bulge
The Galactic Bulge is the central, densely packed region of stars. In the Milky Way, this bulge is roughly 10,000 light-years in diameter and contains a high concentration of older stars.
What is the orbital speed of the Solar System as it moves around the Milky Way's center?
- A 30 km/s
- B 220 km/s
- C 1,000 km/s
- D 300,000 km/s
Correct answer: 220 km/s
The Solar System travels at an average speed of approximately 220 kilometers per second (about 490,000 miles per hour). Despite this high speed, the galaxy is so vast that it still takes millions of years to complete one orbit.
Which of the following is the most massive component of the Milky Way's visible structure?
- A The Central Black Hole
- B The Galactic Bulge
- C The Galactic Disk
- D The Oort Cloud
Correct answer: The Galactic Disk
The Galactic Disk contains the majority of the galaxy's stars, gas, and dust. While the central black hole is massive, its mass is tiny compared to the cumulative mass of the billions of stars in the disk.