Heliocentrism
Heliocentrism is the understanding that the Earth and the other planets orbit the Sun, rather than the Sun and everything else orbiting the Earth.…
byCapsule0 votes0 reviews6/11/2026
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Heliocentrism is the understanding that the Earth and the other planets orbit the Sun, rather than the Sun and everything else orbiting the Earth.…
The idea that the Earth is flat is a debunked belief that the planet is a disc or a plane rather than a sphere. It has been contradicted by…
The northern lights, known scientifically as the aurora borealis, are one of nature's most spectacular displays. Shimmering curtains of green, pink,…
Apollo 11 was the spaceflight that first landed humans on the Moon. On July 20, 1969, the American astronauts Neil Armstrong and Buzz Aldrin walked…
Saturn is the sixth planet from the Sun and the second largest in the Solar System, famous above all for its magnificent rings. A giant ball of gas…
Panspermia is the hypothesis that life exists throughout the universe and is spread between worlds by space dust, meteoroids, asteroids, and comets.…
The Sun is the star at the centre of the Solar System, a vast sphere of hot plasma whose gravity holds the planets in their orbits and whose light…
The universe is about 13.8 billion years old. Once a matter of wide uncertainty and heated debate, this figure is now known with remarkable…
Mars is the fourth planet from the Sun and the most Earth-like of our neighbours, a cold, rusty-red desert world that has captivated humans for…
Dark matter is the leading theoretical framework proposed to explain gravitational effects observed in galaxies and galaxy clusters that cannot be…
Planet Nine is a hypothetical large planet proposed to exist in the far outer reaches of our Solar System, well beyond Neptune and Pluto. It has…
The Rare Earth hypothesis proposes that complex, multicellular life, of the kind found on Earth, is extremely rare in the universe, because it…
The multiverse is the hypothesis that our universe is only one of many, perhaps even infinitely many, other universes. It is taken seriously by many…
Dark energy is the name given to an unknown influence that appears to be driving the expansion of the universe to speed up over time. It is thought…
A black hole is a region of space where gravity is so intense that nothing, not even light, can escape once it passes a certain boundary. They are…
A Dyson sphere is a hypothetical megastructure that an extremely advanced civilization might build around a star to capture a large share of its…
A wormhole is a hypothetical tunnel through spacetime that could, in principle, connect two distant points in the universe, or even two different…
The geocentric model was the ancient belief that the Earth sits motionless at the center of the universe, with the Sun, Moon, planets, and stars all…
The Martian canals were a network of fine, straight lines that some astronomers in the late nineteenth and early twentieth centuries believed they…
The speed of light in a vacuum is a fixed, fundamental constant of nature, equal to about 299,792 kilometres per second. It is the fastest speed at…