Bing Quiz Archive
Astronomy Quiz Archive
Astronomy Quiz: Planets, Stars, Galaxies & Space Science
Revisit the August 19, 2026 featured quiz on astronomy, with questions about planetary rotation, moons, lunar phases, the outer solar system, stars, galaxies, cosmic distances, and dwarf planets.
🌌🔭🪐 Astronomy Quiz • 10 Questions • ⏱️ 150 Seconds
🪐 Planets
⭐ Stars & Light
🌌 Galaxies
🚀 Space Science
⏱️ Time: 150s
✅ Answered: 0/10
Archive mode: answer choices and their A–D labels reshuffle whenever the page loads, so the correct position changes randomly. The 150-second timer begins after your first answer.
1
Which planet takes the longest time to complete one rotation on its axis?
Correct answer: Venus. Venus takes about 243 Earth days to complete one rotation relative to the distant stars, giving it the slowest rotation of any planet.Its rotation is also retrograde, meaning it spins in the opposite direction from most planets.
2
What is the largest moon in our solar system?
Correct answer: Ganymede. Ganymede, a moon of Jupiter, is the largest natural satellite in the solar system.Ganymede is even larger in diameter than the planet Mercury, although it has much less mass.
3
What primarily causes the Moon's phases as seen from Earth?
Correct answer: The changing portion of the Moon's sunlit half that we can see. Half of the Moon is illuminated by the Sun at nearly all times, but its orbit changes how much of that illuminated half is visible from Earth.Earth's shadow causes a lunar eclipse, not the ordinary cycle of lunar phases.
4
What is the Oort Cloud thought to contain?
Correct answer: A distant reservoir of icy objects. The Oort Cloud is a proposed vast region of icy bodies surrounding the solar system far beyond the planets.It is often considered a likely source of many long-period comets.
5
Which visible color is generally associated with the hottest stars?
Correct answer: Blue. Hotter stars emit a greater proportion of their visible light at shorter wavelengths, making many of the hottest stars appear blue or blue-white.Cooler stars tend to look redder, while the Sun appears yellow-white to human eyes.
6
What is the event horizon of a black hole?
Correct answer: The boundary beyond which escape is no longer possible. The event horizon marks the region around a black hole past which nothing, including light, can return to the outside universe.It is not a solid surface; it is a boundary defined by the black hole's gravity and spacetime geometry.
7
Which large galaxy is the closest major galactic neighbor to the Milky Way?
Correct answer: Andromeda Galaxy. Andromeda is the nearest large galaxy to the Milky Way and lies roughly 2.5 million light-years away.Smaller dwarf galaxies are closer to us, which is why the question specifies a large or major galaxy.
8
In the transit method of finding exoplanets, what do astronomers usually look for?
Correct answer: A small repeating dip in a star's brightness. When a planet passes in front of its star from our viewpoint, it blocks a tiny fraction of the starlight and can create a repeating brightness dip.Repeated transits can reveal the planet's orbital period and help estimate its size relative to the star.
9
What process produces most of the Sun's energy?
Correct answer: Nuclear fusion. In the Sun's core, hydrogen nuclei ultimately combine to form helium, releasing energy in the process.That energy gradually travels outward and eventually leaves the Sun as radiation, including visible light.
10
Which dwarf planet is located in the asteroid belt between Mars and Jupiter?
Correct answer: Ceres. Ceres is the largest object in the main asteroid belt and is classified as a dwarf planet.It was the first object discovered in the asteroid belt, in 1801.