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Answer: Korabl-Sputnik 5
Korabl-Sputnik 5 (Aug 1960) returned dogs Belka and Strelka after 18 orbits; Laika (Sputnik 2) died in orbit, making KS-5 first safe biological return.
Answer: Nuclear fission reactor
NTP uses fission reactors to heat liquid hydrogen to ~2500 K, achieving Isp ~900 s vs ~450 s for LH2/LOX chemical engines, enabling faster Mars transit.
Answer: 17 km
TV-D1 conducted on Oct 21, 2023, separated the Crew Escape System at ~17 km altitude during ascent, validating abort sequence and parachute recovery systems.
Answer: Venus
Venus has a runaway greenhouse effect due to its dense CO₂ atmosphere (92 bar pressure), raising surface temperatures to ~465°C, hotter than Mercury despite being farther from the Sun.
Answer: DESTINY+
JAXA's DESTINY+ (Demonstration and Experiment of Space Technology for INterplanetary voYage) targets active asteroid/comet 311P, studying dust ejection mechanisms.
Answer: Gravity Probe B
Gravity Probe B (2004-2011) measured frame-dragging via gyroscope precession, confirming general relativity prediction within ~20% accuracy.
Answer: Silicates and organics/water
C-chondrites contain hydrated minerals, amino acids, and presolar grains, preserving early solar system composition and prebiotic chemistry.
Answer: Mariner 10
Mariner 10 used Venus gravity assist in Feb 1974 to reach Mercury, pioneering planetary flyby technique later exploited by Voyagers and others.
Answer: Solar photovoltaic arrays
SEP converts sunlight to electricity via solar arrays powering electric thrusters, enabling efficient cargo transport (e.g., Psyche, Lunar Gateway HALO).
Answer: Planetary rotation
Jupiter's rapid rotation (9.9 hr) drives magnetospheric dynamics via centrifugal forces and Io plasma torus coupling, unlike solar-wind-dominated Earth.
Answer: ExoMars Schiaparelli
Note: Schiaparelli crashed in 2016; Beagle 2 landed but failed to deploy. No European mission has yet achieved fully successful Mars landing as of 2025.
Answer: NASA
NASA leads Artemis/Gateway program with international partners (ESA, JAXA, CSA), establishing cislunar outpost for sustained lunar exploration.
Answer: Voyager 2
Voyager 2's 1989 Neptune flyby revealed nitrogen geysers on Triton, indicating ongoing geological activity driven by tidal heating or insolation.
Answer: Gravitational redshift/blueshift
Photons climbing out of potential wells lose energy (redshift); falling in gain energy (blueshift), imprinting primordial density perturbations on CMB.
Answer: True - 60x faster
Venusian cloud-top winds reach 100 m/s, circling planet in ~4 days versus 243-day rotation, driven by thermal tides and wave-mean flow interactions.
Answer: Oleg Kononenko
Oleg Kononenko surpassed 1,000 days in space in Feb 2024 across five missions, holding current cumulative duration record.
Answer: Infrared
NEO Surveyor uses infrared detectors to find dark asteroids missed by optical surveys, identifying PHAs >140 m within 5 years of launch.
Answer: Size and longevity
Martian shield volcanoes (e.g., Olympus Mons) are vastly larger due to stationary crust over mantle plumes, allowing prolonged eruptions without plate tectonics.
Answer: 2001
American businessman Dennis Tito paid ~$20M to fly aboard Soyuz TM-32 to ISS in Apr-May 2001, inaugurating commercial space tourism era.
Answer: Roscosmos
Spektr-RG (launched 2019) is Russian-German mission mapping X-ray sky with eROSITA/ART-XC telescopes, discovering millions of AGNs and clusters.