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Timothy Laurence Killeen (born 1952) is a British and American geophysicist, space physicist, professor, and university administrator. [1] Killeen took office as the president of the University of Illinois system in 2015. He has been the principal investigator on research projects for NASA and the National Science Foundation. [2]
Killeen is a city in the U.S. state of Texas, located in Bell County.According to the 2020 census, its population was 153,095, [5] making it the 19th-most populous city in Texas and the largest of the three principal cities of Bell County.
Professor Brian Cox journeys to the volcano worlds of the solar system and explore alien landscapes bursting with fire and ice. There are planets and moons covered in volcanoes, with eruptions so violent they reach into space. Understanding what makes these worlds active is critical in the search for life beyond Earth.
Earth is the third planet from the Sun and the only astronomical object known to harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust.
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Earth observation, like with this famous image of Earth called Blue Marble, has been one of the most basic uses of outer space, having enabled a critical awareness of the global dimension of humanity's impact on Earth. Space and human presence in it has been the subject of different agendas. [2]
Deep space is defined by the United States government as all of outer space which lies further from Earth than a typical low-Earth-orbit, thus assigning the Moon to deep-space. [118] Other definitions vary the starting point of deep-space from, "That which lies beyond the orbit of the moon," to "That which lies beyond the farthest reaches of ...
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