10 free Hot Things trivia questions with answers — trivia quiz, new questions added Aug 2026.
Did you know the surface of the sun reaches 27 million degrees Fahrenheit? But heat isn't just cosmic—it's everywhere, from your kitchen to deep in Earth's core. Ready to test how much you really know about the hottest things on the planet?
All 10 questions with answers and explanations. Play the quiz
Q 01Which planet in our solar system has the highest average surface temperature?
Venus
Despite being farther from the Sun than Mercury, Venus has the hottest surface temperature due to a thick atmosphere composed mostly of carbon dioxide, which creates a strong greenhouse effect.
Q 02What unit is used to measure the spiciness of chili peppers?
Scoville Heat Units
The Scoville scale, invented by American pharmacist Wilbur Scoville in 1912, measures the concentration of capsaicinoids, which are the chemical compounds responsible for the heat in chili peppers.
Q 03Which layer of Earth's atmosphere is generally considered the hottest?
Thermosphere
Temperatures there can pass 2,000 °C, yet a thermometer would read below freezing at night because the gas is so thin it cannot conduct heat to it.
Q 04What is the theoretical lowest possible temperature, where particles have minimal kinetic energy?
0 Kelvin
Absolute zero is the theoretical point at which all atomic motion ceases, and it is defined as 0 Kelvin, which is equivalent to -273.15 degrees Celsius or -459.67 degrees Fahrenheit.
Q 05Which desert animal's humps are actually deposits of fat, not stores of water?
Camel
The one-humped dromedary makes up 94% of the world's camels; the wild two-humped Bactrian is critically endangered with fewer than 1,000 left.
Q 06Stars with which color are typically the hottest?
Blue
Astronomers grade stars O, B, A, F, G, K, M from hottest to coolest; blue O-type stars top the list while our yellow Sun is a middling G2.
Q 07In Greek mythology, who was the god of fire, metalworking, and craftsmanship?
Hephaestus
Cast off Mount Olympus for his lameness, he became the smith of the gods and was equated with Vulcan by the Romans, whose name gives us the word volcano.
Q 08At sea level, roughly what temperature does pure water boil at?
100°C
The precise figure is 99.97 °C; at 1,905 metres of altitude water boils at only 93.4 °C, which is why mountain cooking takes longer.
Q 09Which type of traditional light bulb produces light by heating a filament until it glows?
Incandescent
An incandescent light bulb works by passing an electric current through a thin filament, usually made of tungsten, heating it to a high temperature until it emits light.
Q 10Power plants in Iceland and New Zealand tap the Earth's internal heat. What is this called?
Geothermal energy
Geothermal energy is a renewable energy source that harnesses the natural heat from within the Earth's crust, originating from the planet's formation and radioactive decay.