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What is outer space?
Outer space is the vast expanse that exists beyond Earth's atmosphere. It is a vacuum that contains stars, planets, moons, asteroids, comets, and other celestial bodies. Outer space is characterized by extremely low temperatures, near-vacuum conditions, and the absence of air and gravity. It is also the realm in which spacecraft and satellites travel, allowing for exploration and observation of the universe beyond our planet.
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In which era were the pyramids and the Sphinx built?
The pyramids and the Sphinx were built during the Old Kingdom era of ancient Egypt, which lasted from around 2686 to 2181 BC. The most famous pyramids, such as the Great Pyramid of Giza, were constructed during this time as tombs for the pharaohs. The Sphinx, believed to represent the pharaoh Khafre, was also built during this period as part of the funerary complex near the pyramids.
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When were the Pyramids of Giza and the Sphinx built?
The Pyramids of Giza were built around 2580-2560 BC during the Fourth Dynasty of the Old Kingdom of Egypt. The Great Sphinx, which is located near the Pyramids, is believed to have been built during the same time period, possibly as a part of the funerary complex for Pharaoh Khafre. These ancient structures are some of the most iconic and enduring symbols of ancient Egyptian civilization.
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What happens in outer space?
Outer space is a vast and mostly empty expanse that exists beyond Earth's atmosphere. It is filled with stars, planets, moons, asteroids, comets, and other celestial bodies. In outer space, there is no atmosphere, so there is no air to breathe, no sound, and no weather. It is also a place where the effects of gravity are different, allowing for unique phenomena such as microgravity and the formation of galaxies and other cosmic structures. Additionally, outer space is the setting for human space exploration, satellite communication, and scientific research.
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Where does outer space begin?
Outer space is generally considered to begin at the Kármán line, which is located at an altitude of 100 kilometers (62 miles) above sea level. This is the point at which the Earth's atmosphere becomes too thin to support conventional aircraft flight, and where the concept of air pressure becomes irrelevant. However, there is no universally agreed-upon boundary for outer space, and different organizations and countries may use slightly different definitions.
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Why is outer space black?
Outer space appears black because it is a vacuum, meaning there is no atmosphere to scatter or reflect light. When we look up at the night sky, we are essentially looking out into the vast emptiness of space where there are no particles to bounce light off of. This absence of light sources and scattering particles creates the illusion of darkness, making space appear black to our eyes.
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What is an outer electron?
An outer electron is an electron that is located in the outermost energy level or shell of an atom. These electrons are involved in chemical reactions and bonding with other atoms. The number of outer electrons determines the chemical properties of an element, such as its reactivity and ability to form bonds. Outer electrons are also known as valence electrons.
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What is an outer shell?
An outer shell, also known as a valence shell, is the outermost electron shell of an atom. It is the shell that contains the electrons involved in chemical bonding and interactions with other atoms. The number of electrons in the outer shell determines the chemical properties of an element, as it determines how easily the atom can gain, lose, or share electrons to form chemical bonds. The outer shell is crucial in determining an element's reactivity and its ability to form compounds with other elements.
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