True/False – GK Questions

At 1.5 Schwarzschild radii, photons can theoretically orbit a non-rotating black hole, forming the boundary visible in EHT images as the bright ring.

Despite proximity to the Sun, Mercury's zero axial tilt keeps polar craters in permanent shadow, allowing water ice to persist, confirmed by MESSENGER mission.

Skylab operated from 1973-1979, hosting three crews and conducting solar/astronomical research before re-entering Earth's atmosphere in 1979.

Haumea rotates every ~4 hours, causing extreme flattening into a triaxial ellipsoid. It also has a ring system and two moons.

Wolf-Rayet stars (>20 solar masses) exhibit broad emission lines from intense winds ejecting outer layers, preceding supernova or gamma-ray burst events.

Starlink uses Low Earth Orbit (~550 km) constellations to achieve low latency (~20-40 ms), unlike GEO satellites which have ~600 ms latency due to distance.

Jupiter radiates about twice the energy it absorbs from sunlight, generated by Kelvin-Helmholtz contraction and residual heat from formation.

Korea Aerospace Research Institute (KARI) manages South Korea's space program, including Nuri launch vehicle and KPLO lunar orbiter.

While candidates exist (e.g., HLX-1), intermediate-mass black holes remain elusive and lack definitive confirmation compared to stellar-mass and supermassive black holes.

Discovered in 1977 via stellar occultation, Uranus' 13 known rings are narrow, opaque, and dark, likely containing radiation-processed organic compounds.

UKSA is the executive agency of the UK government responsible for civil space policy, regulation, and international cooperation.

Pulsars are highly magnetized neutron stars rotating at precise intervals, emitting lighthouse-like beams detectable as regular pulses when aligned with Earth.

Hall thrusters ionize propellant (usually xenon) using electric fields, providing efficient low-thrust propulsion for station-keeping and orbit raising in modern satellites.

Saturn's mean density is 0.687 g/cm³, lower than water (1 g/cm³). Theoretically, if placed in a sufficiently large ocean, it would float.

ASTP was the first international crewed spaceflight, symbolizing détente during the Cold War, with American and Soviet spacecraft docking in orbit.

Stephen Hawking theorized that quantum effects near the event horizon cause black holes to emit thermal radiation, leading to gradual mass loss over immense timescales.

Callisto shows no signs of geological resurfacing, preserving impact craters dating back over 4 billion years, making it one of the most ancient surfaces known.

The H-R diagram is a fundamental tool in stellar astrophysics, classifying stars into main sequence, giants, supergiants, and white dwarfs based on absolute magnitude/luminosity vs. spectral class/temperature.

As of recent records, Peggy Whitson holds the record for most cumulative time in space by a woman (>675 days). Sunita Williams has significant time but not the record.

The total mass of the asteroid belt is less than 4% of the Moon's mass, far too little to form even a Mars-sized body. Ceres alone accounts for ~25% of the belt's mass.