Space – True/False – GK Questions

Blazar emission is Doppler-boosted due to relativistic jet alignment with line-of-sight, causing rapid variability and high-energy dominance.

Ceres resides in main asteroid belt between Mars/Jupiter; all other recognized dwarf planets (Pluto, Eris, Haumea, Makemake) are trans-Neptunian.

Triple-junction GaInP/GaAs/Ge cells capture broader solar spectrum, reaching 32-35% efficiency vs ~20% for silicon; standard on GEO/deep space missions.

VLBI/optical interferometry synthesizes aperture equal to baseline length; EHT achieved µas resolution imaging black holes using global telescope network.

C-C composites retain strength above 2000°C without melting, ideal for re-entry vehicle hotspots; used in Space Shuttle nose cone and wing leading edges.

Pluto-Charon system is mutually tidally locked due to close proximity and comparable mass ratio; both bodies keep same hemisphere facing each other permanently.

Massive stars (>8 solar masses) evolve into red supergiants before core collapse triggers Type II-P/L supernovae; Betelgeuse and Antares are current examples.

Tidal dissipation synchronizes rotation/orbital periods over time; most major moons including Earth's Moon are tidally locked.

Passivation vents residual propellants/batteries, eliminating explosion risks; mandated by international guidelines (IADC/UN COPUOS).

Mars' thin atmosphere limits parachute deceleration; payloads >1 ton require supplemental propulsion (sky crane/retro-rockets) as used by Curiosity/Perseverance.

O-stars (>30,000 K, >16 solar masses) dominate UV output and drive feedback in star-forming regions, living only few million years.

Nice model posits giant planets migrated after gas disk dispersal, destabilizing planetesimal disk and triggering LHB ~4 Ga ago.

NASA's OSAM-1 and Northrop Grumman's MEV demonstrate on-orbit servicing/refueling, reducing space debris and maximizing asset value.

Lasercom achieves Gbps-Tbps rates with narrow beams, demanding µrad-level pointing accuracy; demonstrated by LCRD, EDRS, and upcoming Indian missions.

WIMPs naturally arise in supersymmetry theories, interacting via weak nuclear force/gravity, matching observed dark matter abundance through thermal freeze-out.

Objects like 3753 Cruithne exhibit horseshoe orbits relative to Earth, exchanging angular momentum without collision due to 1:1 mean-motion resonance.

3D-printed injectors, chambers, and nozzles consolidate assemblies into single parts, cutting weight/cost; used in SpaceX SuperDraco and ISRO SCE-200 engines.

S-band (2-4 GHz) handles LEO/GEO TT&C; X-band (7-8 GHz) provides higher data rates for deep space links with reduced interference.

Giant molecular clouds (10-20 K, 10²-10⁶ particles/cm³) shield molecules from UV radiation, enabling gravitational collapse and star formation.

Ganymede possesses a dipole magnetic field generated by dynamo action in its liquid iron core, creating a mini-magnetosphere within Jupiter's magnetosphere.