A black hole is a region of space where gravity is so strong that even light cannot escape. Because matter has been compressed into a small space, gravity is extremely strong. This can occur when a star dies. People cannot see black holes because no light can escape. They are unnoticed. Space telescopes equipped with specialised tools can aid in the discovery of black holes. Special tools can observe how stars in close proximity to black holes behave differently than...

Look up at the sky if you're on a dark country hill at night. A faint band of light may appear arcing overhead, resembling milk spilled across the sky. The band was named via lacteal by the ancient Romans, which means "milky road" or "milky way."  Of course, the band of light you see isn't milk—a it's galaxy. A galaxy is a large group of stars that are clustered together in space. Our solar system, which consists of the sun, Earth,...

Uranus is the least massive of the solar system's four giant, or Jovian, planets, which also include Jupiter, Saturn, and Neptune. It is the seventh planet in distance from the Sun and the least massive of the solar system's four giant, or Jovian, planets. Uranus is only visible to the naked eye as a blue-green point of light at its brightest. It's identified by the symbol ♅.
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The way people think about the universe, how it works, and how big it is has evolved over time. Humans had little or no understanding of the universe for countless lifetimes. Instead, our forefathers relied on legend to explain the origins of everything. The myths reflect human concerns, hopes, aspirations, or fears, rather than the nature of reality, because they were created by our forefathers. Humans began to apply mathematics, writing, and new investigative principles to the search for knowledge several centuries ago. Those principles, as well as scientific tools, were refined over time, eventually revealing clues about the nature of the universe.
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Neptune, along with its cousin Uranus, is our solar system's least-explored planet, having only been visited by a spacecraft once. Despite this, we've discovered more Neptune-sized planets orbiting other stars than any other type of planet. To understand other solar systems and determine whether ours is unique, we must first learn more about the windy blue world in our own backyard.It's unclear where Neptune came from or how it got its water. The disc of dust and gas that formed...

Jupiter is the largest planet in the solar system, named after the Roman mythological king of the gods. The gas colossus Jupiter is a stormy enigma, wrapped in colourful clouds whipped by powerful winds that sweep beneath rings and moons. Jupiter is massive: it has more than twice the mass of all the other planets in the solar system combined. The Great Red Spot, its largest and most famous storm, is twice the width of the Earth. Jupiter's four large moons, Io, Europa, Ganymede, and Callisto, helped to revolutionise the way we saw the universe — and our place in it — in 1610, when Galileo discovered them. These were the first observations of celestial bodies circling an object other than Earth, and they supported the Copernican theory that Earth was not the centre of the universe.
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