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Science · Guess the stat

How well do you know binary stars?

Guess the real numbers behind binary star systems, see how everyone else guessed, and get the source.

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For the most massive stars (16+ times the Sun's mass), what share are estimated to have at least one companion star?

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about 22%

For the lowest-mass stars (red dwarfs under 0.1 solar masses), about what share are in binary or multiple systems?

Small, faint red dwarf stars are much less likely to have companions than heavier stars.

Source: Wikipedia, Binary star (2021) en.wikipedia.org

about 1.3

Among the most massive stars, what's the average number of companion stars per system?

On average, the heaviest stars have more than one companion, meaning triple-or-more systems are common among them.

Source: Wikipedia, Binary star (2021) en.wikipedia.org

it increases with mass

As stars get more massive, how does their likelihood of having a companion star change?

Astronomers have found a clear, steady trend: heavier stars are more likely to be born with companions.

Source: Wikipedia, Binary star (2021) en.wikipedia.org

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Each question asks you to guess a real number about binary star systems. After you answer you see how everyone else guessed, then the real figure and where it comes from.

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