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Cosmic Counting

Number Theory

Basic number theory facts applied to astronomical measurements and planetary statistics.

astronomy mathematics science

8 Questions Easy Ages 5+ Aug 26, 2026

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About this Study Set

This study set covers Number Theory through 8 practice questions. Basic number theory facts applied to astronomical measurements and planetary statistics. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 8 questions from the Cosmic Counting study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 How many planets are in our solar system, representing the smallest counting number that is a perfect square?

A 7
B 8
C 9
D 10

2 The number of moons orbiting the planet Earth is represented by which digit?

3 If we represent the number of the planet Earth starting from the Sun as the first, second, or third, which ordinal number is correct?

A 1st
B 2nd
C 3rd
D 4th

4 How many primary colors are there in the visible spectrum of light observed from stars, a prime number?

A 5
B 7
C 9
D 11

5 Which of these numbers represents the total count of 'Giant' planets in our solar system, also known as an even number?

6 The number of axes of rotation an ideal sphere like a star possesses is represented by which integer?

7 In the binary number system, which is used in space exploration computing, what is the smallest positive integer?

A 0
B 1
C 2
D 10

8 How many Earth days does it take for the Moon to orbit our planet approximately, a number that is a multiple of seven?

A 21
B 28
C 35
D 42

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