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Space and Astronomy

Comets Practice Questions

20 free Comets 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.

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Question 1 of 20 Medium

Comets are often colloquially referred to by what name, coined by astronomer Fred Whipple?

  1. A Dirty Snowballs
  2. B Space Fireballs
  3. C Gas Giants
  4. D Frozen Stars

Correct answer: Dirty Snowballs

In 1950, Fred Whipple proposed the 'dirty snowball' model, suggesting comets are mixtures of volatile ices and dust. This model accurately describes how comets sublimate as they approach the Sun.

Question 2 of 20 Medium

What is the solid, central part of a comet called?

  1. A Coma
  2. B Tail
  3. C Halo cloud
  4. D Nucleus

Correct answer: Nucleus

The nucleus is the small, solid core of a comet consisting of rock, dust, and frozen gases. It is typically only a few kilometers in diameter and is the source of all comet activity.

Question 3 of 20 Medium

Which spherical region, located far beyond the orbit of Pluto, is the source of long-period comets?

  1. A Kuiper Belt
  2. B Asteroid Belt
  3. C Van Allen Belt
  4. D The Oort Cloud

Correct answer: The Oort Cloud

The Oort Cloud is a theoretical spherical shell of icy objects surrounding the Solar System at distances up to 50,000 AU. Comets originating here can take thousands or even millions of years to orbit the Sun.

Question 4 of 20 Medium

A comet's 'coma' is created through which physical process?

  1. A Sublimation
  2. B Evaporation
  3. C Condensation
  4. D Nuclear Fusion

Correct answer: Sublimation

Sublimation occurs when frozen gases in the nucleus turn directly into gas without passing through a liquid phase. This gas carries dust with it, forming a large, thin atmosphere known as the coma.

Question 5 of 20 Medium

In what direction does a comet's tail always point?

  1. A Away from the Sun
  2. B Toward the Sun
  3. C Behind the comet's path of motion
  4. D Toward the closest planet

Correct answer: Away from the Sun

Solar wind and radiation pressure push the gas and dust away from the comet's head. Consequently, the tail always points away from the Sun, regardless of which way the comet is traveling.

Question 6 of 20 Medium

Which famous comet has an orbital period of approximately 76 years and was last seen in 1986?

  1. A Hale-Bopp
  2. B Encke
  3. C Shoemaker-Levy 9
  4. D Halley's Comet

Correct answer: Halley's Comet

Halley's Comet (1P/Halley) is the most famous periodic comet and is visible from Earth to the naked eye. It is scheduled to return to the inner solar system in 2061.

Question 7 of 20 Medium

Comets usually possess two distinct tails; what are they composed of?

  1. A Dust and Ionized Gas
  2. B Fire and Ice
  3. C Water Vapor and Carbon Dioxide
  4. D Rock and Metal

Correct answer: Dust and Ionized Gas

The dust tail is made of small solid particles and is often curved, while the ion (gas) tail is made of electrically charged molecules and is usually straight and bluish.

Question 8 of 20 Medium

The Kuiper Belt is the primary source for which type of comets?

  1. A Short-period comets
  2. B Long-period comets
  3. C Interstellar comets
  4. D Sun-grazing comets

Correct answer: Short-period comets

Short-period comets have orbital periods of less than 200 years. They originate from the Kuiper Belt, a disk-shaped region of icy objects located just beyond the orbit of Neptune.

Question 9 of 20 Medium

Which comet collided with the planet Jupiter in 1994, providing the first direct observation of an extraterrestrial collision?

  1. A Comet Hyakutake (1996)
  2. B Comet Borrelly
  3. C Comet Wild 2
  4. D Comet Shoemaker-Levy 9

Correct answer: Comet Shoemaker-Levy 9

Shoemaker-Levy 9 was captured and broken into fragments by Jupiter's gravity. The resulting impacts left dark scars in Jupiter's atmosphere that were visible for months.

Question 10 of 20 Medium

What is the name of the European Space Agency mission that successfully landed the 'Philae' probe on Comet 67P in 2014?

  1. A Stardust
  2. B Deep Impact
  3. C Rosetta
  4. D Giotto

Correct answer: Rosetta

The Rosetta mission was the first to orbit a comet nucleus and the first to deploy a lander to a comet's surface. It provided unprecedented data on the composition and activity of Comet 67P/Churyumov–Gerasimenko.

Question 11 of 20 Medium

The annual Perseid meteor shower is caused by debris left behind by which comet?

  1. A Comet Swift-Tuttle
  2. B Comet Temple-Tuttle
  3. C Comet Halley
  4. D Comet Thatcher

Correct answer: Comet Swift-Tuttle

When Earth passes through the trail of dust left by Comet Swift-Tuttle, the particles burn up in our atmosphere. This creates the Perseids, one of the most reliable and brightest meteor showers of the year.

Question 12 of 20 Medium

Which part of a comet can sometimes reach a size larger than the diameter of the Sun?

  1. A The Core
  2. B The Coma
  3. C The Dust Tail
  4. D The Ion Tail

Correct answer: The Coma

While the nucleus is small, the coma can expand to be millions of kilometers wide as it approaches the Sun. On rare occasions, this temporary atmosphere can exceed the physical size of the Sun.

Question 13 of 20 Medium

What does the 'P' stand for in the formal designation of a comet like 19P/Borrelly?

  1. A Planetary
  2. B Primary
  3. C Periodic
  4. D Parabolic

Correct answer: Periodic

The letter 'P' indicates a periodic comet, defined as having an orbital period of less than 200 years or confirmed observations of more than one perihelion passage. 'C' is used for non-periodic comets.

Question 14 of 20 Medium

The NASA 'Stardust' mission was significant because it:

  1. A Crashed into a comet to study its interior
  2. B Landed a human on a comet
  3. C Returned comet dust samples to Earth
  4. D Took the first photo of a comet's nucleus

Correct answer: Returned comet dust samples to Earth

Launched in 1999, Stardust flew through the coma of Comet Wild 2 and collected samples using aerogel. The sample return capsule landed in Utah in 2006, giving scientists the first look at pristine comet material.

Question 15 of 20 Medium

Which of these is the shortest-period comet known, orbiting the Sun every 3.3 years?

  1. A Comet 2P/Encke
  2. B Comet Tempel 1
  3. C Comet Hartley 2
  4. D Comet Wirtanen

Correct answer: Comet 2P/Encke

Comet Encke (2P/Encke) has the shortest orbital period of any known comet in the solar system. Because it visits the inner solar system so frequently, its ices are significantly depleted.

Question 16 of 20 Medium

What term describes comets that pass extremely close to the Sun, often being destroyed in the process?

  1. A Sun-scorchers
  2. B Sun-grazers
  3. C Sun-divers
  4. D Heliocentric comets

Correct answer: Sun-grazers

Sun-grazing comets have perihelion distances very close to the Sun's surface. Many are members of the Kreutz family, which are fragments of a single giant comet that broke apart centuries ago.

Question 17 of 20 Medium

In 1705, who was the first person to predict the return of a comet based on Newton's laws of motion?

  1. A Isaac Newton
  2. B Edmond Halley
  3. C William Herschel
  4. D Tycho Brahe

Correct answer: Edmond Halley

Edmond Halley calculated that the comets seen in 1531, 1607, and 1682 were actually the same object. His successful prediction of its return in 1758 proved that comets orbit the Sun like planets.

Question 18 of 20 Medium

What is the typical color of a comet's ion tail, and why?

  1. A Red, due to iron oxide particles
  2. B Yellow, due to reflected sunlight
  3. C Blue, due to ionized carbon monoxide
  4. D Green, due to cyanogen gas emissions

Correct answer: Blue, due to ionized carbon monoxide

The ion tail usually glows blue because of the fluorescence of ionized carbon monoxide ($CO^+$) molecules. The dust tail, by contrast, appears white or yellowish because it simply reflects sunlight.

Question 19 of 20 Medium

Which was the first interstellar comet ever identified passing through our solar system?

  1. A 'Oumuamua
  2. B 2I/Borisov
  3. C C/2019 Q4
  4. D Comet Hale-Bopp

Correct answer: 2I/Borisov

While 'Oumuamua was the first interstellar object, 2I/Borisov was the first interstellar object clearly identified as a comet. It was discovered in 2019 by amateur astronomer Gennady Borisov.

Question 20 of 20 Medium

What happens to a 'dead' comet that has lost all its volatile ices?

  1. A It disintegrates completely
  2. B It turns into a gas giant
  3. C It resembles a rocky asteroid
  4. D It falls into the Sun immediately

Correct answer: It resembles a rocky asteroid

When a comet has 'exhausted' its volatiles, it can no longer develop a coma or tail. These objects are often called 'extinct comets' and can be difficult to distinguish from dark D-type asteroids.

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