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The Solar System and Planetary Science

Essential planetary astronomy flashcards covering planet features, moon systems, solar structure, and orbital dynamics.

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Hottest Planet in the Solar System
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1
Hottest Planet in the Solar System
Venus, with average surface temperatures around 465 deg C due to an extreme carbon dioxide greenhouse effect.
2
Planet with the Most Prominent Ring System
Saturn, whose rings consist predominantly of water-ice particles with trace rock and dust.
3
Largest Moon in the Solar System
Ganymede (orbiting Jupiter), which is larger in diameter than the planet Mercury.
4
The Great Red Spot
A persistent high-pressure anticyclonic storm in Jupiter's southern hemisphere observed for centuries.
5
Closest Known Star to the Sun
Proxima Centauri, a red dwarf star in the Alpha Centauri system located ~4.24 light-years away.
6
Olympus Mons
The largest known shield volcano in the Solar System, located on Mars and rising ~21.9 km above datum.
7
Kuiper Belt
A circumstellar disc of icy bodies and dwarf planets (including Pluto) extending beyond Neptune's orbit (30-55 AU).
8
Oort Cloud
A theoretical vast spherical shell of icy planetesimals surrounding the Solar System up to ~100,000 AU, source of long-period comets.
9
Planet with the Shortest Orbital Period
Mercury, completing one revolution around the Sun in approximately 88 Earth days.
10
Planet with Retrograde Axial Rotation
Venus, rotating clockwise on its axis from east to west with a 243-Earth-day rotational period.
11
Only Moon Known to Have a Dense Atmosphere
Titan (orbiting Saturn), featuring a dense nitrogen-rich atmosphere and liquid methane-ethane surface lakes.
12
Asteroid Belt Location
The circumstellar disc located roughly between the orbits of Mars and Jupiter, containing Ceres, Vesta, and Pallas.
13
Visible Surface Layer of the Sun
The Photosphere, having an effective temperature of approximately 5,778 K (5,500 deg C).
14
Outermost Atmosphere of the Sun
The Corona, extending millions of kilometers into space with temperatures reaching 1 to 3 million Kelvin.
15
Primary Nuclear Fusion Reaction in the Sun
The Proton-Proton Chain reaction, fusing four hydrogen nuclei (protons) into one helium-4 nucleus.
16
Distance from Earth to the Sun (1 AU)
Approximately 149.6 million kilometers (roughly 8.3 light-minutes).
17
Largest Planet in the Solar System
Jupiter, possessing more than twice the mass of all other planets in the Solar System combined.
18
Planet Tilted on its Side (~98 deg)
Uranus, which rolls around the Sun on its orbital plane with extreme seasonal variations.
19
Four Galilean Moons of Jupiter
Io (volcanically active), Europa (subsurface ocean), Ganymede (largest), and Callisto (heavily cratered).
20
First Man-Made Object to Leave the Heliosphere
Voyager 1, launched in 1977, entered interstellar space in August 2012.
21
Hubble Space Telescope Orbit
Low Earth Orbit (~540 km), deployed by the Space Shuttle Discovery in April 1990.
22
James Webb Space Telescope Location
Sun-Earth Lagrange Point 2 (L2), approximately 1.5 million kilometers from Earth.

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