Science & Space
Planets, stars, elements and the extremes of the measurable universe.
32 lists in this topic.
Top 10 Largest Satellite Constellations in the World by Active Satellites in Orbit
The ten biggest satellite networks in orbit as of September 2026, ranked by the number of working satellites each one operates.
spaceTop 10 Most Massive Black Holes in the Universe by Mass
The ten most massive black holes ever found, ranked by estimated mass in billions of solar masses.
archaeologyTop 10 Largest Pyramids in the World by Volume
Ranked by estimated structural volume, from Cholula's 4.45 million cubic meters down to Teotihuacan's Pyramid of the Moon.
spaceTop 10 Most Distant Human-Made Spacecraft from Earth
The farthest human-made objects in space, ranked by distance from the Sun in astronomical units.
scienceTop 10 Largest Planets in the Solar System by Diameter
The ten largest bodies classified as planets or dwarf planets by the IAU, ranked by equatorial diameter from Jupiter down to Eris, per NASA's Planetary Fact Sheet and IAU data.
materialsTop 10 Hardest Materials by Vickers Hardness
The ten hardest known materials measured by Vickers hardness, from diamond at 115 GPa to zirconia at 14 GPa — ranked by measured Vickers hardness in gigapascals.
scienceTop 10 Most Luminous Stars by Bolometric Luminosity
The ten most luminous stars known by bolometric luminosity, from the supermassive Wolf-Rayet stars of the Tarantula Nebula to the brilliant blue hypergiants of the Milky Way — ranked by solar luminosities.
materialsTop 10 Strongest Materials by Tensile Strength
The ten strongest known materials, ranked by ultimate tensile strength from graphene and diamond to everyday engineering materials.
spaceTop 10 Largest Known Galaxies by Diameter
The ten largest known galaxies by diameter, from the immense IC 1101 down to the Triangulum Galaxy.
spaceTop 10 Largest Radio Telescopes by Dish Diameter in the World
The ten largest single-dish radio telescopes in the world, ranked by aperture diameter, from China's massive 500-meter FAST to the 64-meter Parkes Observatory in Australia.
scienceTop 10 Planets by Orbital Period
Mercury whips around the Sun in just 88 Earth days, while Neptune takes 165 Earth years — a single Neptunian year has spanned the entire history of modern astronomy.
spaceTop 10 Rockets by Payload Capacity to Low Earth Orbit
Starship's theoretical LEO payload of 150 tonnes dwarfs every rocket ever built, but the Saturn V still holds the record for the heaviest payload actually delivered to orbit in a single launch.
scienceTop 10 Largest Volcanic Eruptions in History by VEI
The largest volcanic eruptions ever recorded, ranked by the Volcanic Explosivity Index (VEI) — a logarithmic scale that measures the expelled volume of tephra.
scienceTop 10 Planets and Dwarf Planets by Number of Moons
The ten planets and dwarf planets in our Solar System with the most confirmed moons, ranked by the number of known natural satellites in orbit.
scienceTop 10 Strongest Earthquakes Ever Recorded by Magnitude
The 1960 Valdivia earthquake in Chile — magnitude 9.5 — is the strongest earthquake ever recorded, more than 10 times more powerful than the second-strongest.
scienceTop 10 Largest Known Stars by Radius
The ten largest stars ever measured, ranked by solar radii — led by the red hypergiant Stephenson 2-18, whose diameter would swallow Saturn's orbit.
chemistryTop 10 Most Abundant Elements in Earth's Crust
The ten most common chemical elements in the Earth's continental crust by mass fraction — oxygen alone makes up nearly half of everything beneath our feet.
chemistryTop 10 Chemical Elements by Highest Melting Point
The ten chemical elements with the highest melting points at standard pressure — from tungsten and rhenium to technetium and ruthenium.
chemistryTop 10 Densest Chemical Elements by Density
The ten densest naturally occurring and synthetic elements ranked by density at standard temperature and pressure — from osmium and iridium to tantalum.
materialsTop 10 Hardest Minerals by Mohs Hardness
The ten hardest minerals ranked on the Mohs scale of mineral hardness, from diamond's perfect 10 down to the boundary with softer minerals at hardness 5.
spaceTop 10 Largest Confirmed Exoplanets by Radius
The ten largest known exoplanets with confirmed radii, from ultra-puffy gas giants larger than 1.5 Jupiter radii down to the edge of the giant planet category.
scienceTop 10 Brightest Stars in the Night Sky by Apparent Magnitude
The ten stars that shine brightest to the naked eye, ranked by apparent visual magnitude — the inverted, logarithmic scale where the most negative number wins.
spaceTop 10 Closest Known Exoplanets to Earth by Distance
The ten nearest confirmed exoplanets all orbit red dwarfs within about 11 light-years of the Sun, led by two worlds circling Proxima Centauri.
scienceTop 10 Largest Asteroids by Diameter
The ten biggest bodies in the asteroid belt, ranked by mean diameter from spacecraft, adaptive-optics imaging, and stellar occultation data.
scienceTop 10 Largest Impact Craters on Earth by Diameter
The ten biggest confirmed asteroid and comet scars on Earth, ranked by the diameter of the impact structure they left behind.
scienceTop 10 Largest Meteorites Found on Earth by Mass
The ten heaviest individual meteorite masses ever recovered on Earth, ranked by estimated mass in tonnes, from Namibia's 60-tonne Hoba giant down through the great irons of Argentina, China, and Greenland.
spaceTop 10 Largest Optical Telescopes by Mirror Aperture
The biggest eyes on the sky: the ten largest operational ground-based optical telescopes, ranked by effective primary mirror aperture.
spaceTop 5 Most Distant Human-Made Spacecraft from Earth
The five spacecraft on escape trajectories out of the Solar System, ranked by how far they now sit from the Sun.
scienceTop 8 Largest Planets in the Solar System by Diameter
All eight planets ranked by equatorial diameter, from the gas giant Jupiter down to tiny Mercury, per NASA's Planetary Fact Sheet.
materialsTop 10 Densest Metals by Density
Osmium and iridium tie for the top of the periodic table's heavyweight class, both packing over 22 grams into every cubic centimeter.
scienceTop 10 Largest Moons in the Solar System by Diameter
The ten biggest natural satellites orbiting the Sun's planets, ranked by mean diameter using NASA/JPL figures.
scienceTop 10 Nearest Star Systems to Earth by Distance
The ten closest stellar systems to the Sun, ranked by distance in light-years from Gaia DR3 and RECONS parallax measurements.