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Cosmic Statistics and Probabilities

Statistics & Probability

Test your knowledge of statistical and probabilistic concepts applied to celestial bodies and cosmic phenomena.

astronomy probability statistics space

10 Questions Medium Ages 5+ Sep 3, 2026

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About this Study Set

This study set covers Statistics & Probability through 10 practice questions. Test your knowledge of statistical and probabilistic concepts applied to celestial bodies and cosmic phenomena. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 10 questions from the Cosmic Statistics and Probabilities study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 If you randomly select a dwarf planet from the IAU's current list, what is the approximate probability that it resides within the asteroid belt?

A 1/10
B 1/5
C 1/2
D 9/10

2 Considering the observed number of confirmed exoplanets, what is the statistical likelihood that a star similar to our Sun in the Milky Way has at least one planet?

A Less than 10%
B Around 25%
C Greater than 80%
D Close to 100%

3 Given the known number of planets in our solar system and the definition of a planet, what is the probability of selecting a gas giant if you pick one planet at random?

A 1/4
B 1/2
C 3/8
D 5/8

4 If we consider all known moons in our solar system, what is the approximate probability that a randomly chosen moon orbits Jupiter?

A 15%
B 30%
C 45%
D 60%

5 What is the statistical probability that a randomly selected asteroid from the main asteroid belt is larger than Ceres (the largest dwarf planet)?

A Extremely low (<0.001%)
B Low (around 1%)
C Moderate (around 10%)
D High (>50%)

6 Based on observations of meteor showers, if you were to witness a random meteor streak across the night sky from Earth, what is the most probable origin of that meteor?

A Interstellar space
B The Oort Cloud
C A comet's debris trail
D The Kuiper Belt

7 If we consider all observed supernovae in distant galaxies, what is the statistical chance that a supernova event will occur in our own Milky Way galaxy within the next 100 years?

A Very high (over 50%)
B Moderate (around 10-20%)
C Low (less than 1%)
D Extremely low (practically zero)

8 What is the approximate statistical probability that a randomly chosen exoplanet discovered within the habitable zone of its star will be rocky, similar to Earth?

A Less than 20%
B Between 20% and 50%
C Between 50% and 80%
D Greater than 80%

9 Given the total number of recognized constellations, what is the probability of randomly selecting a constellation that is officially designated as being in the Northern celestial hemisphere?

A Exactly 50%
B Slightly less than 50%
C Slightly more than 50%
D Around 25%

10 If you were to randomly sample 100 stars from the Sun's stellar neighborhood, what is the statistically expected number of red dwarf stars you would find, given their prevalence?

A Around 5
B Around 25
C Around 75
D Around 95

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