Current Affairs MCQs – Page 46 (Q451-460)

Alan Shepard became the first American astronaut to travel into space on May 5, 1961, completing a brief 15-minute suborbital flight aboard the Freedom 7 capsule, just weeks after Soviet cosmonaut Yuri Gagarin's historic orbital flight. His mission was a critical early milestone for NASA's Mercury program during the height of the Cold War Space Race. Neil Armstrong, Buzz Aldrin and John Glenn are tempting distractors, with Glenn later becoming the first American to orbit the Earth in 1962 and Armstrong and Aldrin achieving the historic Moon landing years later. Shepard later commanded the Apollo 14 mission in 1971, becoming the fifth person to walk on the Moon.

Neil Armstrong became the first human to walk on the Moon on July 20, 1969, stepping onto the lunar surface during NASA's Apollo 11 mission and famously declaring it one small step for man, one giant leap for mankind. He was joined on the lunar surface shortly afterward by fellow astronaut Buzz Aldrin, while Michael Collins remained in orbit aboard the command module. Buzz Aldrin, Yuri Gagarin and Michael Collins are tempting distractors, with Aldrin actually being the second person to walk on the Moon and Gagarin instead holding the distinction of being the first human in space. Armstrong's Moon landing remains one of the most celebrated achievements in human history.

The Apollo 11 mission achieved humanity's first crewed Moon landing in 1969, when astronauts Neil Armstrong and Buzz Aldrin touched down in the Sea of Tranquility on July 20 while Michael Collins orbited above in the command module. The mission fulfilled President John F. Kennedy's 1961 goal of landing a man on the Moon before the end of the decade. 1971, 1967 and 1965 are tempting distractors, with 1971 corresponding to later Apollo missions such as Apollo 14 and 15. An estimated 600 million people worldwide watched the Moon landing live on television, making it one of the most-watched events in history.

Valentina Tereshkova, a Soviet cosmonaut, became the first woman to travel into outer space on June 16, 1963, orbiting the Earth 48 times aboard the Vostok 6 spacecraft over nearly three days. Remarkably, she remains the only woman to have flown a solo space mission, as all later female astronauts have flown as part of larger crews. Svetlana Savitskaya, Sally Ride and Mae Jemison are tempting distractors, with Ride later becoming the first American woman in space in 1983 and Jemison the first African American woman in space in 1992. Tereshkova's flight was another major propaganda victory for the Soviet Union during the Space Race.

Alexei Leonov, a Soviet cosmonaut, performed the first spacewalk in history on March 18, 1965, spending about 12 minutes outside his Voskhod 2 spacecraft connected only by a tether, a mission that nearly ended in disaster when his suit ballooned and he struggled to re-enter the capsule. His pioneering extravehicular activity was another major milestone for the Soviet space program during the Cold War Space Race. Yuri Gagarin, Buzz Aldrin and Neil Armstrong are tempting distractors, with Gagarin instead holding the distinction of being the first human in space four years earlier. Leonov later commanded the Soviet side of the 1975 Apollo-Soyuz Test Project, a symbolic gesture of Cold War cooperation in space.

NASA, the National Aeronautics and Space Administration, was founded in 1958 by the United States government in direct response to the Soviet Union's launch of Sputnik 1 the previous year, which had shocked American policymakers and the public. The agency absorbed the earlier National Advisory Committee for Aeronautics and quickly became the central hub of American space exploration efforts. 1955, 1961 and 1965 are tempting distractors, with 1961 notably being the year President Kennedy announced the goal of landing a man on the Moon. NASA went on to lead the Apollo Moon landing program, the Space Shuttle program, and countless robotic exploration missions across the solar system.

Apollo 11 achieved humanity's first crewed Moon landing in July 1969, when astronauts Neil Armstrong and Buzz Aldrin descended to the lunar surface in the Eagle lunar module while Michael Collins orbited above. The mission was the culmination of NASA's Apollo program, launched in response to President Kennedy's 1961 challenge to land a man on the Moon within the decade. Apollo 13, Apollo 8 and Apollo 10 are tempting distractors, with Apollo 8 having been the first crewed mission to orbit the Moon in 1968 and Apollo 13 famously suffering a near-catastrophic malfunction in 1970 without landing. Apollo 11's success was watched live by hundreds of millions of people around the world.

Jupiter is the largest planet in the solar system, with a mass more than twice that of all the other planets combined, and is famous for its Great Red Spot, a giant storm that has raged for centuries. It is a gas giant composed mainly of hydrogen and helium, with dozens of known moons, including the four large Galilean moons discovered by Galileo Galilei in 1610. Saturn, Uranus and Neptune are tempting distractors as the other three gas or ice giants in the solar system, but none matches Jupiter's massive size. Jupiter's strong gravity plays an important role in shielding the inner solar system from many comets and asteroids.

Mercury is the smallest planet in the solar system, only slightly larger than Earth's Moon, and also the closest planet to the Sun, completing an orbit in just 88 Earth days. Its lack of a substantial atmosphere leads to extreme temperature swings between blisteringly hot days and freezing nights. Pluto, Mars and Venus are tempting distractors, with Pluto having once been classified as the ninth planet before being reclassified as a dwarf planet in 2006. Mercury has been studied by several NASA spacecraft, including the MESSENGER mission, which orbited the planet from 2011 to 2015.

Mercury is the planet closest to the Sun, orbiting at an average distance of about 58 million kilometres, completing a full orbit in just 88 Earth days despite rotating very slowly on its own axis. Its proximity to the Sun results in extreme surface temperature variations, since it has almost no atmosphere to retain heat. Earth, Mars and Venus are tempting distractors as other rocky inner planets of the solar system, but none orbits closer to the Sun than Mercury. Mercury's heavily cratered surface closely resembles that of Earth's Moon, reflecting billions of years of impacts with minimal geological activity to erase them.