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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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...

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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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...

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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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,...