Hard Level – GK Questions

Type I/II disk migration or high-eccentricity tidal circularization explains hot Jupiter presence interior to snow line where gas giant formation is unlikely.

Arrokoth's bilobate shape with aligned lobes indicates low-speed merger of two planetesimals in cold classical Kuiper Belt, preserving early solar system conditions.

First stars/galaxies ionized neutral hydrogen between z~20-6 (~180 Myr-1 Gyr post-Big Bang), ending cosmic dark ages; confirmed by CMB polarization and quasar spectra.

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.

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.

Gravity Probe B (2004-2011) measured frame-dragging via gyroscope precession, confirming general relativity prediction within ~20% accuracy.

Jupiter's rapid rotation (9.9 hr) drives magnetospheric dynamics via centrifugal forces and Io plasma torus coupling, unlike solar-wind-dominated Earth.

Photons climbing out of potential wells lose energy (redshift); falling in gain energy (blueshift), imprinting primordial density perturbations on CMB.

NEO Surveyor uses infrared detectors to find dark asteroids missed by optical surveys, identifying PHAs >140 m within 5 years of launch.

FRB 200428 linked to Galactic magnetar SGR 1935+2154 confirmed magnetars as FRB sources, though extragalactic FRBs may have diverse origins.

Earth trojans librate around L4 (leading) and L5 (trailing) points; 2010 TK7 (L4) and 2020 XL5 (L4) are confirmed examples.

PSLV Orbital Experimental Module (POEM) uses depleted PS4 stage as stabilized platform hosting payloads for weeks/months post-primary mission separation.

Short GRBs (<2 s) originate from compact object mergers; long GRBs (>2 s) from collapsars/massive star deaths, differing in progenitors and host galaxies.

Voyager 1 crossed the heliopause on Aug 25, 2012, becoming the first human-made object to enter interstellar space, confirmed by plasma density jump.

Deformable mirrors adjust shape hundreds of times per second based on wavefront sensor data, compensating for atmospheric turbulence in real-time.

Parker Solar Probe performs multiple Venus flybys to shrink its orbit and reduce perihelion distance, eventually reaching within 6.2 million km of the Sun.

Hall thrusters achieve 1000-3000 s specific impulse versus 300-450 s for chemical rockets, enabling efficient station-keeping and orbit raising despite low thrust.

JUICE (JUpiter ICy moons Explorer) launched April 2023, arriving 2031 to study habitability of Ganymede, Europa, and Callisto.

NASA's New Horizons conducted the first Pluto flyby on July 14, 2015, revealing glaciers, mountains, and atmospheric haze on the dwarf planet.

China's Chang'e 5 returned 1.7 kg of lunar regolith in December 2020, the first lunar sample return in 44 years, from Oceanus Procellarum.