The Earth is the third planet from the Sun and the only known astronomical object to support life. While there is a lot of water all over the Solar System, only Earth has liquid surface water. The ocean covers roughly 71% of the Earth's surface, dwarfing polar ice, lakes, and rivers. The remaining 29% of the Earth's surface is land, which consists of continents and islands. The surface layer of the Earth is made up of several slowly moving tectonic...

Mars is the fourth planet in the solar system. The Romans named the Red Planet after their god of war, which suited the planet's bloody hue. In reality, the Romans copied the ancient Greeks, who named the planet Ares after their god of war. Other civilizations also gave the planet names based on its colour, such as the Egyptians, who named it "Her Desher," which means "the red one," and ancient Chinese astronomers, who dubbed it "the fire star."Mars' bright rust colour is due to iron-rich minerals in its regolith, which is the loose dust and rock that covers its surface. Earth's soil is also a type of regolith, albeit one with a high organic content. The iron minerals oxidise, or rust, causing the soil to appear red, according to NASA.
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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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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,...

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...

The sun is the largest object in the solar system, and it is located in the centre of it. It contains 99.8% of the mass of the solar system and has a diameter of roughly 109 times that of the Earth; one million Earths could fit The sun's surface is about 10,000 degrees Fahrenheit (5,500 degrees Celsius) hot, while nuclear reactions drive temperatures in the core to over 27 million degrees Fahrenheit (15 million degrees Celsius). According to NASA, to match the energy produced by the sun, 100 billion tonnes of dynamite would have to be exploded every second. inside it.
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