Tag: science & technology

Laika, a Soviet stray dog, became the first living creature to orbit Earth aboard Sputnik 2 on November 3, 1957. While she did not survive the mission, she pioneered living space travel. Later animals were sent into space, but Laika was first.

The Apollo missions (especially Apollo 11, 12, 14-17) landed astronauts on the Moon and left behind descent stages, scientific instruments, flags, and personal items - collectively described as expensive rubbish. The Voyager and Pioneer were deep space probes, while Sputnik was an early Soviet satellite.

Saturn's rings are composed primarily of ice particles (90-95% ice), ranging from tiny grains to house-sized chunks, along with smaller amounts of rocky dust and chemical compounds. They are not gases, clouds, wind, or storms, but solid material orbiting the planet.

Jupiter has the most confirmed moons (95 as of 2024), followed by Saturn (146 confirmed). This is due to Jupiter's massive gravitational field capturing and retaining numerous small moons. Earth has one moon, while Neptune has 14 known moons.

Skylab was the heaviest object launched into space at approximately 77 metric tons (169,000 lbs). It was significantly heavier than the Salyut space stations and far exceeded the mass of satellites or typical spacecraft like Luna. The U.S. space station remained in orbit from 1973 to 1979.

The word 'galaxy' originates from the Greek word 'galaxias' (γαλαξίας), meaning 'milky,' which refers to the Milky Way's appearance as a band of light. Latin uses a different root, and the term predates both Russian and English as established scientific vocabulary. English adopted the word via Greek and Latin influences.

Quarks are fundamental particles that cannot be broken down into smaller components - they are elementary constituents of matter. Electrons are also fundamental, but protons and neutrons are composite particles made of quarks. Option A incorrectly groups fundamental (electron) with composite (proton) particles, while B is composite.

John Dalton proposed the first modern atomic theory (1803), establishing the concept that all matter is composed of atoms. J.J. Thomson discovered the electron (1897) and proposed the plum pudding model, while Rutherford discovered the proton and nuclear structure (1911). Dalton's foundational work came first.

J.J. Thomson discovered the electron in 1897 through cathode ray tube experiments, demonstrating the existence of negatively charged subatomic particles. This led to his plum pudding model of the atom. Thomson did not discover the atom (Dalton), proton (Rutherford), or neutron (Chadwick).

Ernest Rutherford discovered the proton in 1917-1919 through experiments with nitrogen gas, identifying hydrogen nuclei as a fundamental component of all atomic nuclei. This followed his earlier gold foil experiments that revealed the nucleus. Einstein developed relativity theory, Maxwell formulated electromagnetic theory, and Dalton proposed atomic theory (but didn't discover the proton).