Science Quiz / Cosmic Objects

Random Science or Physics Quiz

Can you name 60 increasingly difficult cosmic objects and phenomena based on their description?

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Also try: X is for Xplosion
Score 0/60 Timer 15:00
Massive sphere of plasma, shining due to thermonuclear reactions.
Celestial body orbiting a planet or planetoid.
Large planet that is not primarily composed of solid matter.
Small planet-like object that has not cleared its neighboring region.
Region of the solar system located between Mars and Jupiter, occupied by numerous asteroids.
Prevailing model for the early development of the universe, often misinterpreted as an explosion.
Small, icy body that heats up and releases gas as it approaches the Sun.
Late phase of stellar evolution undergone by moderately massive stars, such as our Sun.
Disk of dust, moonlets, or other small objects orbiting a planet or similar body.
Extremely massive stellar remnant which gravity prevents even photons from escaping.
Solid piece of debris from outer space that is not destroyed upon impact with the ground.
Powerful explosion occurring at the end of a massive star's life, that can outshine an entire galaxy.
Interstellar cloud of dust, hydrogen, helium and other ionized gases.
Name given to Jupiter's four largest moons, Io, Europa, Callisto and Ganymede.
Planet orbiting a star or stellar remnant other than Earth's Sun.
Point at which a gravitational pull becomes so great as to make escape impossible.
Aura of plasma surrounding the Sun and other stars. Can reach temperatures over 1,000,000 K.
Relatively cool type of standard star with a very long main sequence.
System consisting of two stars orbiting around their common center of mass.
Highly magnetized, rotating neutron star that emits a beam of electromagnetic radiation.
Extremely energetic explosion consisting of a narrow beam of intense radiation.
Gravitationally bound structure of hundreds to thousands of galaxies.
Spherical cloud of comets believed to surround the Sun at up to 50,000 AU.
Supernova explosion with an energy output far higher than that of a standard supernova.
Galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy.
Substellar object too low in mass to sustain thermonuclear fusion.
Massive group of smaller galaxy clusters, among the largest known structures of the universe.
Any minor planet in the Solar System that orbits the Sun at a greater distance than Neptune.
Gas giant made up mostly of materials heavier than hydrogen and helium. (e.g. Uranus, Neptune)
Rocky extrasolar planet with a mass higher than Earth's.
Large mass that forms by contraction out of the gas of a nebula. Early stage of star evolution.
Matter hypothesized to account for gravitational effects seemingly resulting from invisible mass.
Planet-like object that orbits the galaxy rather than a star. Also called interstellar planet.
Star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
Possible future for an ever-expanding universe, eventually becoming cold and devoid of stars.
Distance within which a celestial body will disintegrate due to a second celestial body's tidal forces.
Planet located in a star's habitable zone, neither too far nor too close.
Structure formed by diffuse material in orbit around a massive central body, such as a black hole.
Variable star that can undergo unpredictable dramatic increases in brightness for a few minutes.
Possible fate of the universe, in which all matter is progressively torn apart by its expansion.
Exceptionally bright meteor, typically one that explodes in the atmosphere.
Flow of neutral or charged gas ejected from the upper atmosphere of a star.
White dwarf that has radiated all of its residual heat. Has not yet appeared in the universe.
Type of neutron star with an extremely powerful magnetic field.
Planetary body larger than Ceres, but smaller than Mercury.
Quake-like event that occurs when the crust of a neutron star undergoes a sudden adjustment.
Hypothetical object which cannot be entered, although matter and light can escape from it.
Interstellar cloud whose density and size permit the formation of molecules and stars.
Object sharing its orbit with a more massive body, at its L4 or L5 points.
Matter existing in the space between star systems in a galaxy, such as gas, dust and cosmic rays.
Vast empty space between filaments which contain very few, or no, galaxies.
Galaxy undergoing an exceptionally high rate of star formation.
Extrasolar, high temperature giant planet orbiting very close to its star.
Very hot star over 20 more massive than Earth's Sun, losing mass rapidly.
Compact quasar with a supermassive black hole at the center of an active, giant elliptical galaxy.
Hypothetical class of planets resulting from the stripping away of a gas giant's atmosphere.
Compact star composed of something other than electrons, protons, and neutrons.
Hypothetical type of star that could occur in the universe in 10^1500 years, barring proton decay.
Astronomical object which emits large bursts of gamma-rays and X-rays at irregular intervals.
Cataclysmic event in which a metastable sector of space falls to a lower energy state.

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