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...

Venus is the second planet from the Sun and the sixth largest and most massive planet in the solar system. Venus is the closest large body to Earth other than the Moon; at its closest, it is the closest large body to Earth. Venus' orbit is closer to the Sun than Earth's, so the planet is always roughly in the same direction in the sky as the Sun and can only be seen near sunrise or sunset. It is the most brilliant planet in the sky when visible. The planet Venus is represented by the symbol ♀.
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Mercury is our solar system's smallest planet and the closest to the sun. The tiny planet has no moon and orbits the sun faster than any other planet, which is why the Romans named it after their swift-footed messenger god. Mercury was also known to the Sumerians at least 5,000 years ago. According to a site connected to NASA's MESSENGER (Mercury Surface, Space Environment, Geochemistry, and Ranging) mission, it was frequently associated with Nabu, the god of writing. Mercury was...

The Moon is the only place on the planet where humans have set foot. The Moon, the brightest and largest object in our night sky, makes Earth a more livable planet by dampening our planet's wobble on its axis, resulting in a relatively stable climate. It also causes tides, which have guided humans for thousands of years. The Moon was most likely formed as a result of a Mars-sized body colliding with Earth. The Moon is the fifth largest of our solar system's 200+ moons orbiting planets. Because no one knew there were other moons until Galileo Galilei discovered four moons orbiting Jupiter in 1610, Earth's only natural satellite is simply referred to as "the Moon."
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Space is also teeming with various types of radiation that are hazardous to astronauts. The Sun is responsible for a large portion of this infrared and ultraviolet radiation. High energy X-rays, gamma rays, and cosmic rays – particles travelling at near-light speed – arrive from distant star systems.
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