Betelgeuse Trivia
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47 free Betelgeuse trivia questions with answers — science & nature quiz, new questions added Sep 2026.
Betelgeuse is the reddest bright star in the sky, big enough to swallow Mars's orbit, and it made headlines in 2019 when it faded so hard that people wondered whether it was about to explode. This quiz covers the star from every angle: where it sits in Orion, its Bayer letter, its size, mass, distance and age, the type II supernova to come, its runaway motion and bow shock, and the 1920 measurement that made it the first star beyond the Sun to have its disk sized. You will also meet the Great Dimming and the dust that caused it, the Hubble image of 1995, the candidate companion Siwarha, the Arabic phrase behind the name and its 'armpit' mistranslation, the Beetlejuice pronunciation, Ptolemy, John Herschel, the Heike clan, the Lakota chief and the Inuit 'large star'. Easy questions suit any stargazer; the expert tier asks for asteroids, observatories and Sanskrit. Every answer was checked against Wikipedia's articles on Betelgeuse, Orion and the Winter Triangle, and the supporting sentence is attached to each question. If you like this, try our quizzes on stars and constellations and on the Solar System.
30 of 47 questions with answers and explanations. Play the quiz
Q 01Betelgeuse belongs to the constellation Orion, which depicts what figure from Greek myth?
A hunter
A hunter: Orion's belt lies almost on the celestial equator, which is why the figure can be seen from almost any part of the world.
Q 02What type of star is Betelgeuse?
Red supergiant
Red supergiant: stars of this class are nearing the end of their lives and have puffed up in old age into the largest stars in the universe.
Q 03Astronomers also catalogue Betelgeuse under which Greek-letter designation?
Alpha Orionis
Alpha Orionis: alpha normally marks a constellation's brightest star, yet Betelgeuse is usually only second in its own.
Q 04Which star is usually the only one in Betelgeuse's constellation that outshines it?
Rigel
Rigel usually wins, but Betelgeuse's brightness swings so widely that it occasionally takes the lead for a while.
Q 05Betelgeuse usually ranks about where among the brightest stars in the night sky?
Around 10th
Around 10th: reference lists put Betelgeuse anywhere from ninth to eleventh, because its brightness never stays put.
Q 06At which wavelengths is Betelgeuse the brightest star in the night sky?
Near-infrared
Near-infrared: only about 13% of Betelgeuse's energy emerges as visible light, so eyes sensitive to every wavelength would see it as the brightest star in the sky.
Q 07If Betelgeuse sat at the centre of the Solar System, its surface would lie beyond which zone?
The asteroid belt
The asteroid belt: it would swallow Mercury, Venus, Earth and Mars, and by some estimates reach as far as Jupiter's orbit.
Q 08Betelgeuse's brightness normally rises and falls over about 400 days because the star does what?
Swells and shrinks
Swells and shrinks: its unstable outer layers heat and expand, then cool and contract, and the 2019 outburst was violent enough to knock that steady beat out of rhythm.
Q 09Astronomers think Betelgeuse's core has run out of hydrogen and most likely now fuses which element?
Helium
Helium: the core is thought to be forging it into carbon and oxygen, one of the last fuel stages in a massive star's short life.
Q 10Betelgeuse lies roughly how many light-years from Earth?
About 600
About 600: estimates run from under 500 to more than 700 light-years, far enough that its eventual supernova poses no danger to life on Earth.
Q 11Betelgeuse is expected to explode as a supernova most likely within how long?
100,000 years
100,000 years is the usual estimate, so despite the supernova headlines that follow every fade, astronomers see no sign that the blast is imminent.
Q 12When Betelgeuse finally explodes, it should for months rival what in brightness?
The Moon
The Moon: estimates run from a half to a full Moon's light squeezed into a single point, enough to cast shadows at night and to be seen in full daylight.
Q 13What is expected to set off Betelgeuse's supernova?
Its core collapsing
Its core collapsing: when fusion can no longer hold the core up it caves in on itself, and the rebound tears the star apart in what astronomers class as a Type II supernova.
Q 21What is Betelgeuse's 2019–20 episode of fading commonly called?
The Great Dimming
The Great Dimming: telescopes showed the star's southern half had gone dark, yet by April 2020 Betelgeuse was back to its normal brightness.
Q 22Astronomers traced Betelgeuse's sudden 2019–20 fade to which cause?
Dust from a surface mass ejection
Dust from a surface mass ejection: the star blew off a chunk of its own surface, which cooled into a cloud that hid about a quarter of its face.
Q 23Betelgeuse will keep fusing heavier and heavier elements until it reaches which one, the end of the line?
Iron
Q 14Though near the end of its life, Betelgeuse is only about how many million years old?
10
10 million years or so: massive stars race through their fuel, so Betelgeuse is already dying while the far smaller Sun is only middle-aged at nearly 5 billion years.
Q 15Betelgeuse's red colour tells astronomers that its surface is what, compared with the Sun's?
Cooler
Cooler: its surface is about 3,300°C against the Sun's 5,500°C, yet the star is so vast that it still pours out thousands of times more light.
Q 16In 1920, Betelgeuse became the first star beyond the Sun to have what measured?
Its angular size
Its angular size: Betelgeuse was picked for the 1920 test because theory predicted it was enormous, and the disc astronomers measured was about a twentieth of an arcsecond wide.
Q 17In 1920, Michelson and Pease studied Betelgeuse with an interferometer bolted to which California observatory's 100-inch telescope?
Mount Wilson
Mount Wilson: its 100-inch Hooker telescope was then the largest in the world, and a six-metre beam of mirrors across its mouth let it act like a far wider one.
Q 18Why can't ESA's star-mapping Gaia spacecraft pin down Betelgeuse's distance?
It is too bright
It is too bright: Gaia was built to chart more than a billion faint stars, so the dazzling ones easiest to see by eye are largely missing from its data.
Q 19Which instrument captured the first direct image of another star's disk, Betelgeuse, in 1995?
Hubble Space Telescope
Hubble Space Telescope: its ultraviolet picture revealed a mysterious bright spot at least 2,000 degrees hotter than the surface around it.
Q 20When Betelgeuse explodes, which particles should reach detectors on Earth before its light does?
Neutrinos
Neutrinos: they slip out of an exploding star ahead of its light, so a network of detectors stands ready to tip off astronomers before the explosion can be seen.
Iron: fusing it gives back no energy, so once the star's furnace fills with iron it has nothing left to burn.
Q 24Betelgeuse's slow six-year rhythm of fading and brightening is best explained by what?
A companion star
A companion star: nicknamed Betelbuddy and since named Siwarha, it is thought to plough through the supergiant's outer atmosphere about once every six years.
Q 25From which language does the name Betelgeuse come?
Arabic
Arabic: the phrase most likely meant 'hand of al-Jawza', and a medieval scribe's misreading of its first letter turned the y into the b the name still carries.
Q 26Betelgeuse's name is popularly, though wrongly, said to mean which body part 'of the central one'?
Armpit
Armpit: Renaissance scholars invented that reading after a copyist's slip had already turned the original 'hand' into a syllable that meant nothing.
Q 27In Beetlejuice, which actor plays the ghost whose name is actually spelled Betelgeuse, like the star?
Michael Keaton
Michael Keaton: the film's screenwriter confirmed the title comes from the star, and wherever the ghost's name is written on screen it takes the official spelling.
Q 28Which classical astronomer described Betelgeuse's colour as hypókirrhos, 'more or less orange-tawny'?
Ptolemy
Ptolemy: his word can cover pale yellow to light red, and ancient colour records like it have led astronomers to ask whether Betelgeuse reddened within recorded history.
Q 29Which astronomer documented Betelgeuse's changing brightness in 1836?
Sir John Herschel
Sir John Herschel published it in his 1849 Outlines of Astronomy, but Aboriginal Australian oral traditions appear to have recorded the star's changes long before him.
Q 30In Japanese folk tradition, red Betelgeuse is named after which clan, whose war banners were red?
The Taira (Heike)
The Taira (Heike): country stargazers called red Betelgeuse Heike-boshi and gave a white star nearby to the Minamoto, whose banners were white.