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The concept of the "distance between space and Earth" is not well-defined because space is not a distinct physical boundary that can be measured in terms of distance from the Earth's surface. However, if you are referring to the distance between the Earth and objects or locations in space, that can be measured and expressed in various ways. When it comes to space exploration, distances are often expressed in terms of average distances between celestial bodies or the spacecraft that explore them. Here are some common measures: 1. Distance to the Moon: The average distance from Earth to the Moon is approximately 384,400 kilometers (238,900 miles). This distance can vary due to the Moon's elliptical orbit. 2. Distance to the Sun: The average distance from Earth to the Sun is about 149.6 million kilometers (93 million miles). This is known as an astronomical unit (AU), which serves as a convenient reference for distances within our solar system. 3. Distance to other Planets: Distances to other planets in our solar system can vary greatly depending on their orbits. For example, at its closest point, Mars can be around 54.6 million kilometers (33.9 million miles) away from Earth, while at its farthest, it can be approximately 401 million kilometers (249 million miles) away. 4. Interstellar distances: When considering distances beyond our solar system, it becomes more common to use units like light-years, which is the distance light travels in one year. For instance, the nearest star system to our solar system, Alpha Centauri, is located about 4.37 light-years away. It's important to note that these distances are averages and can vary due to the elliptical orbits of celestial bodies or the constant expansion of the universe. Additionally, space is a vast and ever-expanding expanse without a distinct boundary, so specifying a precise distance between space and Earth is not possible.

A black hole is an extremely dense region in space where gravity is so strong that nothing, not even light, can escape its gravitational pull.