Explore fun questions and answers about Astronomy, Science, and the Human Body.
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Jupiter is the largest planet in our solar system. It's a gas giant with a mass greater than all other planets combined.
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Leonardo da Vinci painted the Mona Lisa between 1503 and 1519. It's one of the most famous paintings in the world.
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Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
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Japan is known as the Land of the Rising Sun. This name comes from Japan's position to the east of China.
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The speed of light in a vacuum is approximately 299,792,458 meters per second (about 186,282 miles per second).
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William Shakespeare wrote Romeo and Juliet around 1594-1596. It's one of his most famous tragedies.
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Canberra is the capital of Australia. Many people mistakenly think it's Sydney or Melbourne.
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An adult human has 206 bones. Babies are born with about 270 bones, but many fuse together as they grow.
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Vatican City is the smallest country in the world, with an area of only 0.17 square miles (0.44 square kilometers).
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Alexander Graham Bell is credited with inventing the telephone in 1876, though the invention involved contributions from many scientists.
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Paris is the capital and largest city of France. It's known as the 'City of Light' and is famous for the Eiffel Tower.
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A triangle has 3 sides. It's the simplest polygon and its angles always add up to 180 degrees.
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The giraffe.
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Mars.
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False — snakes do not have eyelids, so they don’t blink.
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The tongue.
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The blue whale.
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Photosynthesis.
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False — hippos cannot swim or float well.
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Because of how sunlight interacts with Earth’s atmosphere — shorter blue light wavelengths scatter more, making the sky look blue.
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About 1 million.
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The Great Red Spot.
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No, space is silent.
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The triple point.
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Because the Moon has lower gravity.
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Venus
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Jupiter
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Gravity
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The Milky Way
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Proxima Centauri
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Event horizon
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Saturn
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Meteorite
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Hydrogen
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Isaac Newton
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Saturn
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A constellation
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A supernova
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One year (about 365.25 days)
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Sputnik 1
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Uranus
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A comet
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Neil Armstrong
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The asteroid belt
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The Moon passes between the Earth and the Sun, blocking sunlight
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An atom
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Oxygen
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Solid, liquid, and gas
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Gravity
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H2O
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Evaporation
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A herbivore
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Biology
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A rainbow
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Diamond
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The skin
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Four
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To carry oxygen throughout the body
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The heart
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Blood
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The kidneys
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The liver
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23 pairs
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The cerebellum
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About 60 to 100 beats per minute
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Mars
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The Sun
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Gravity
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Saturn
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Jupiter
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Meteor
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The Milky Way
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Mercury
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About 300,000 kilometers per second
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Earth's rotation
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Venus
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Oxygen tanks
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Neil Armstrong
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Jupiter
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Astronomy
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Mercury
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The Moon's gravity
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Constellation
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Uranus
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The Moon
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The Sun
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Comet
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Earth
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Venus
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Hubble Space Telescope
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Gravity
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Neptune
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Orbit
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Saturn
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Pluto
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Earth's tilt and orbit around the Sun
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Titan
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Event horizon
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Sputnik
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Jupiter
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Physics
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Andromeda Galaxy
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Supernova
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Perseverance
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Neptune
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Salyut 1
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Sunlight
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Apollo 11
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Jupiter
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Valentina Tereshkova
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Axis
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South Pole-Aitken Basin
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Saturn
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Columbia
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One year
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They and their spacecraft are continuously falling around Earth together.
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An orbit.
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It reflects light from the Sun.
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Earth moves between the Sun and the Moon and blocks sunlight from reaching the Moon.
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A meteor burns in the atmosphere, while a meteorite reaches the ground.
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They travel around a smaller orbit and move faster around the Sun.
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A planet that orbits a star outside our solar system.
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To provide strong thrust and help the rocket escape Earth's gravity.
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To provide pressure and oxygen and protect astronauts from the vacuum of space.
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A large research laboratory that orbits Earth.
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Distance, equal to the distance light travels in one year.
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Their light has traveled across space to reach our eyes.
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A large cloud of gas and dust in space.
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They form when clouds of gas and dust collapse under gravity.
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It may explode as a supernova and leave behind a neutron star or black hole.
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An extremely dense object made mostly of tightly packed neutrons.
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Their colors depend mainly on their surface temperatures.
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A huge collection of stars, gas, dust, and dark matter held together by gravity.
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Matter that does not give off or reflect light but affects objects through gravity.
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A region beyond Neptune containing many icy objects and dwarf planets.
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A rocky or metallic object that orbits the Sun.
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Solar wind and sunlight push gas and dust away from the Sun.
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To move across the surface, take pictures, and study rocks and soil.
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Iron minerals in its soil have rusted and give the surface a reddish color.
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The warming of a planet when certain gases trap heat in its atmosphere.
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Ice is less dense than liquid water because of its open crystal structure.
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The tendency of an object to resist changes in its motion.
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A force that opposes motion when two surfaces rub together.
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The rate at which velocity changes.
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Speed in a particular direction.
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The amount of matter in an object.
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Weight is the force of gravity on an object, while mass is the amount of matter it contains.
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The law of inertia.
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F = ma, meaning force equals mass multiplied by acceleration.
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For every action, there is an equal and opposite reaction.
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The ability to do work or cause change.
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Energy an object has because of its motion.
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Stored energy due to an object's position or condition.
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Energy cannot be created or destroyed, only transferred or changed into another form.
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Metal conducts heat away from your hand faster than wood.
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A complete path through which electric current can flow.
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The flow of electric charge.
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Metal, such as copper.
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The south pole of another magnet.
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The bouncing of light from a surface.
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The bending of light when it passes from one material into another.
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Light refracts as it moves between water and air.
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The number of vibrations or waves passing a point each second.
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A higher frequency produces a higher pitch.
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Particles are closer together in solids, allowing vibrations to transfer more quickly.