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GRACE-FO mission measures temporal gravity field variations to track groundwater depletion and ice mass loss.
- True - twin satellites ranging via microwave/laser
- False - measures magnetic field
- True - single satellite radar
- False - optical imaging only
Answer: True - twin satellites ranging via microwave/laser
GRACE Follow-On (2018-) detects mass redistribution via intersatellite distance changes; laser ranging interferometer enhances precision over original GRACE.
Pair-instability supernovae occur in very massive stars (140-260 solar masses) where gamma rays create electron-positron pairs reducing _______.
- Opacity
- Radiation pressure support
- Nuclear fuel
- Rotation rate
Answer: Radiation pressure support
Pair production reduces photon pressure triggering catastrophic core contraction/explosion completely disrupting star; leaves no remnant unlike core-collapse SN.
The first commercial communications satellite Telstar 1 was launched in which year?
- 1958
- 1962
- 1965
- 1970
Answer: 1962
Telstar 1 (July 10, 1962) relayed first live transatlantic TV signals; AT&T/Bell Labs project demonstrated commercial viability of satellite communications.
Which space agency operates the MetOp series of polar-orbiting meteorological satellites?
- NOAA
- EUMETSAT
- JMA
- BOM
Answer: EUMETSAT
MetOp-A/B/C provide operational weather/environmental data for European/global forecasting; successor MetOp-SG launches mid-2020s.
Dragonfly rotorcraft mission will explore Titan's prebiotic chemistry starting in _______.
- 2028
- 2034
- 2040
- 2050
Answer: 2034
Dragonfly (NASA NF4) launches 2028, arrives Titan 2034; nuclear-powered quadcopter will sample diverse terrains studying organic synthesis pathways.
Auroral emissions on Jupiter are primarily driven by _______ rather than solar wind interaction.
- Volcanic plasma from Io
- Internal magnetic reconnection
- Cosmic ray bombardment
- Ring particle charging
Answer: Volcanic plasma from Io
Io's volcanic SO₂ ionizes forming plasma torus; corotation enforcement currents accelerate electrons precipitating into polar atmosphere generating persistent aurorae.
VIPER rover mission targeted lunar south pole to map water ice distribution but was cancelled in 2024 due to budget/schedule issues.
- True
- False - still scheduled
- True - replaced by CLPS
- False - renamed Artemis Rover
Answer: True
NASA cancelled VIPER July 2024 after cost overruns/delays; science objectives partially addressed by CLPS landers and future Artemis missions.
Transmission spectroscopy during planetary transits reveals atmospheric composition by analyzing wavelength-dependent _______.
- Emission lines
- Absorption depth variations
- Polarization
- Phase curves
Answer: Absorption depth variations
Atmospheric species absorb specific wavelengths increasing effective planet size; JWST transmission spectra detect H₂O/CO₂/CH₄ in exoplanet atmospheres.
The first spacewalk by a Chinese taikonaut was performed during which Shenzhou mission?
- Shenzhou 5
- Shenzhou 7
- Shenzhou 9
- Shenzhou 12
Answer: Shenzhou 7
Zhai Zhigang conducted China's first EVA on Sep 27, 2008, lasting ~20 minutes wearing Feitian spacesuit; milestone in CNSA human spaceflight.
Which space agency leads the Europa Clipper mission to investigate habitability of Jupiter's moon?
- ESA
- NASA
- JAXA
- Roscosmos
Answer: NASA
Europa Clipper (launch Oct 2024) conducts detailed reconnaissance of Europa's ice shell/ocean/interface assessing astrobiological potential.
ISRO's RLV-TD HEX-01 test in 2016 validated hypersonic flight characteristics at Mach _______.
- 3
- 5
- 8
- 10
Answer: 5
HEX-01 reached Mach ~5 during re-entry from 65 km altitude, testing aero-thermodynamics/navigation/control for reusable launch vehicle concept.
Io's tenuous SO₂ atmosphere is sustained primarily by _______.
- Outgassing from volcanoes
- Sublimation of surface frost
- Solar wind sputtering
- Cometary impacts
Answer: Outgassing from volcanoes
Io's extreme volcanism continuously replenishes SO₂ atmosphere against loss to Jupiter's magnetosphere; plumes reach 500 km altitude depositing fresh frost.
Lucy mission will explore Trojan asteroids sharing Jupiter's orbit at L4/L5 points.
- True - launched 2021 arriving 2027+
- False - targets main belt
- True - completed flybys already
- False - cancelled mission
Answer: True - launched 2021 arriving 2027+
Lucy launched Oct 2021 will visit eight Trojans over 12-year tour, probing diversity and origins of these primordial remnants.
Helioseismology probes solar interior structure by analyzing oscillation modes of the photosphere.
- True - reveals convection zone depth/radiative zone rotation
- False - only studies surface
- True - but only for flares
- False - requires spacecraft
Answer: True - reveals convection zone depth/radiative zone rotation
p-mode/g-mode frequencies constrain internal sound speed profile, revealing tachocline location and differential rotation; validated solar models.
The first EVA using a self-contained backpack propulsion unit (MMU) was performed during which shuttle mission?
- STS-7
- STS-41-B
- STS-61
- STS-82
Answer: STS-41-B
Bruce McCandless II conducted untethered EVA using MMU on Feb 7, 1984, demonstrating free-flying capability for satellite retrieval/servicing.
Which space agency operates the KOMPSAT series of multipurpose satellites?
- JAXA
- KARI
- CNSA
- ISA
Answer: KARI
KOMPSAT (Korea Multi-Purpose Satellite) series provides EO/weather/tech demo capabilities; KOMPSAT-7 offers 0.5 m panchromatic resolution.
Voyager 2 is the only spacecraft to have visited Uranus and Neptune.
- True - flew by both in 1986/1989
- False - Voyager 1 also visited
- True - but New Horizons visited Neptune
- False - no spacecraft visited Uranus
Answer: True - flew by both in 1986/1989
Voyager 2 conducted Uranus flyby Jan 1986 and Neptune flyby Aug 1989; no subsequent missions have visited ice giants, leaving major knowledge gaps.
Maxwell Montes is the highest mountain range on which planet?
- Mars
- Venus
- Mercury
- Earth
Answer: Venus
Maxwell Montes rises ~11 km above Venusian mean radius on Ishtar Terra; formed by tectonic compression rather than volcanism unlike most Venusian highlands.
NISAR satellite will use dual-frequency SAR (L-band and S-band) to measure surface deformation with _______ accuracy.
- Meter-level
- Centimeter-level
- Millimeter-level
- Kilometer-level
Answer: Centimeter-level
NISAR's interferometric SAR measures crustal deformation, ice flow, and biomass changes at cm-scale resolution every 12 days globally.
Kilonovae are electromagnetic counterparts to neutron star mergers producing heavy elements via _______.
- Silicon burning
- R-process nucleosynthesis
- Proton-proton chain
- Triple-alpha process
Answer: R-process nucleosynthesis
GW170817 kilonova confirmed r-process production of gold/platinum/lanthanides in neutron-rich ejecta, resolving origin of half elements heavier than iron.