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A few successful lunar missions by the USSR include missions such as the Luna 1 spacecraft that completed the first flyby of the Moon in 1959, the Luna 3 lunar probe that took the first pictures of the far side of the Moon in 1959, the Luna 10 orbiter that was the first orbiter of the Moon in 1966, the Zond 5 circumlunar mission which flew the ...
Human presence in space is particularly being felt in orbit around Earth. The orbital space around Earth has seen increasing and extensive human presence, beside its benefits it has also produced a threat to it by carrying with it space debris, potentially cascading into the so-called Kessler syndrome. [5]
Science fiction often depicts humans successfully repelling alien invasions, but scientists more often take the view that an extraterrestrial civilization with sufficient power to reach the Earth would be able to destroy human civilization or humanity with minimal effort.
Anyone who rejects the benefits of science and the scientific method should toss away their smartphone, stop using the internet and social media, never travel on an airplane, and ignore medical ...
Reaching Jupiter from Earth requires a delta-v of 9.2 km/s, [42] which is comparable to the 9.7 km/s delta-v needed to reach low Earth orbit. [43] Fortunately, gravity assists through planetary flybys can be used to reduce the energy required at launch to reach Jupiter, albeit at the cost of a significantly longer flight duration.
Earth and the Moon viewed from Mars's orbit. Space and survival is the idea that the long-term survival of the human species and technological civilization requires the building of a spacefaring civilization that utilizes the resources of outer space, [1] and that not doing this might lead to human extinction.
Launching materials from Earth is expensive, so bulk materials for colonies could come from the Moon, a near-Earth object (NEO), Phobos, or Deimos. The benefits of using such sources include: a lower gravitational force, no atmospheric drag on cargo vessels, and no biosphere to damage. Many NEOs contain substantial amounts of metals.
The Earth's outer core is liquid, but it is liquid metal, not rock. [259] The Amazon rainforest does not provide 20% of Earth's oxygen. This is a misinterpretation of a 2010 study which found that approximately 34% of photosynthesis by terrestrial plants occurs in tropical rainforests (so the Amazon rainforest would account for approximately ...