space enviorment and its challenge essay of 100 words
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Outer space, or simply space, is the expanse that exists beyond Earth and between celestial bodies. Outer space is not completely empty—it is a hard vacuumcontaining a low density of particles, predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, neutrinos, dust, and cosmic rays. The baseline temperature of outer space, as set by the background radiationfrom the Big Bang, is 2.7 kelvins (−270.45 °C; −454.81 °F)
Space exploration is the use of astronomyand space technology to explore outer space. While the exploration of space is carried out mainly by astronomers with telescopes, its physical exploration though is conducted both by unmanned robotic space probes and human spaceflight. Space exploration, like its classical form astronomy, is one of the main sources for space science.
While the observation of objects in space, known as astronomy, predates reliable recorded history, it was the development of large and relatively efficient rockets during the mid-twentieth century that allowed physical space exploration to become a reality. Common rationales for exploring space include advancing scientific research, national prestige, uniting different nations, ensuring the future survival of humanity, and developing military and strategic advantages against other countries.
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