Everyday Science

Amino acids are the building blocks of proteins and are produced when proteins are digested by enzymes in the body. Carbohydrates, fats, and vitamins do not break down into amino acids.

The International Space Station (ISS) is currently the largest artificial object in space, as it is a massive habitable satellite orbiting Earth. Other options like AI powered robots or parabolic aircraft are not space objects, and 'None of the above' is incorrect.

NASA's Artemis program is the official initiative to return humans to the Moon, targeting a landing in 2024. The other options are incorrect and do not correspond to any known NASA programs.

The solar wind, a stream of charged particles emitted by the Sun, creates a vast bubble in the interstellar medium known as the heliosphere. This bubble protects the solar system from cosmic radiation.

The International Space Station completes an orbit around Earth approximately every 90 minutes at an altitude close to 400 km. This orbital period allows it to circle the planet about 16 times per day.

The moon's surface is covered by a layer of fine dust and broken rock called regolith, which is formed by the constant bombardment of micrometeorites and solar wind. 'Regolith' is the correct term, while 'Gegolith' and 'Megolith' are incorrect or nonexistent terms in this context.

A nanometer (nm) is defined as one billionth of a meter, which is 10 to the power of -9 meters. Therefore, 1 nanometer equals 10^-9 meters.

The Oort cloud is generally estimated to be located at a distance of about 50,000 to 100,000 astronomical units (AU) from the Sun, making 100,000 AU the closest and most accepted estimate among the options provided.

A planet's year is the time it takes to complete one orbit around the Sun. Among the options given, Mercury has the shortest year (88 Earth days), Venus has a year of 225 Earth days, Earth has a year of 365 days, and Mars has a year of 687 Earth days. Therefore, Mars has the longest year among the options provided, not Earth. The original answer was incorrect in stating Earth had the longest year among the options; Mars actually has the longest year among the four planets listed.

The Kuiper Belt was first proposed by Dutch-American astronomer Gerard Kuiper in 1951, who suggested a belt of small icy bodies beyond Neptune. The Oort Cloud was proposed earlier, in 1950, by Dutch astronomer Jan Hendrik Oort to explain the origin of long-period comets. Since the question asks who first proposed both the Kuiper Belt and the Oort Cloud, the correct answer is Jan Oort for the Oort Cloud and Gerard Kuiper for the Kuiper Belt. Among the given options, only option B correctly identifies Jan Oort (Dutch astronomer) in 1950, who proposed the Oort Cloud, and the question's phrasing is ambiguous but the best fit is option B. Option A incorrectly attributes both to Kuiper, and option D incorrectly calls Jan Oort French. Therefore, option B is the most accurate.