Tag: science & technology

NASA's Juno mission launched in 2011 and has been orbiting Jupiter since 2016, studying the gas giant's composition, gravity field, magnetic field, and polar magnetosphere. It was specifically designed for Jupiter, not for Mars, Venus, or Neptune.

New Horizons was the first mission to Pluto, conducting a historic flyby in July 2015 after a 9-year journey. It provided unprecedented close-up images and data of Pluto and its moons. Options A and B refer to Saturn and Venus (with typos); option D likely refers to the dwarf planet Eris.

Pluto was reclassified from a planet to a dwarf planet by the International Astronomical Union in 2006. It was considered the ninth planet until this reclassification occurred. The other options (Neptune, Jupiter) remain classified as planets, while the Moon is a natural satellite, not a planet.

The gas giants in our solar system are Jupiter, Saturn, Uranus, and Neptune. These large outer planets are composed primarily of hydrogen and helium. Venus is a terrestrial planet with a solid surface, while Pluto is classified as a dwarf planet, not a gas giant.

An orbit is the curved path that a celestial object follows around another object in space. Earth's orbit around the Sun takes approximately 365.25 days to complete. Rotation refers to Earth spinning on its own axis, which takes about 24 hours and causes day and night.

Apparent magnitude measures how bright a star appears from Earth, which depends on both its intrinsic brightness (absolute magnitude) and its distance from us. A very bright star far away may appear dim, while a dim star nearby may appear bright. Size alone doesn't determine apparent brightness.

Our galaxy, the Milky Way, is classified as a spiral galaxy. It has barred spiral structure with multiple arms extending from a central bar. Elliptical galaxies are oval-shaped, whirlpool refers to a specific galaxy (M51), and ring galaxies have a ring-like structure - none of these describe our galaxy.

Venus has the hottest average surface temperature in our solar system at about 465°C (869°F) due to its thick atmosphere of carbon dioxide that creates an extreme greenhouse effect. Mercury, despite being closer to the Sun, has no atmosphere to trap heat and has a much lower average temperature.

Our solar system has orbited the center of the Milky Way galaxy approximately 20 times since its formation 4.6 billion years ago. One galactic orbit (galactic year) takes about 230 million years. The options of 'not yet once', '1000', and '1 million' are all incorrect estimates.