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Answer: False
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.
Answer: True
Discovered in 1977 via stellar occultation, Uranus' 13 known rings are narrow, opaque, and dark, likely containing radiation-processed organic compounds.
Answer: True
UKSA is the executive agency of the UK government responsible for civil space policy, regulation, and international cooperation.
Answer: True
Pulsars are highly magnetized neutron stars rotating at precise intervals, emitting lighthouse-like beams detectable as regular pulses when aligned with Earth.
Answer: True
Hall thrusters ionize propellant (usually xenon) using electric fields, providing efficient low-thrust propulsion for station-keeping and orbit raising in modern satellites.
Answer: True
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.
Answer: True
ASTP was the first international crewed spaceflight, symbolizing détente during the Cold War, with American and Soviet spacecraft docking in orbit.
Answer: True
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.
Answer: True
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.
Answer: True
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.
Answer: False
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.
Answer: False
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.
Answer: True
Brown dwarfs have masses between giant planets and low-mass stars (~13-80 Jupiter masses). They may briefly fuse deuterium but never sustain stable hydrogen fusion.
Answer: True
Millions of pieces of defunct satellites, rocket stages, and fragments orbit Earth at high velocities, increasing collision risks and threatening sustainable space operations.
Answer: False
Triton has a retrograde orbit (opposite to Neptune's rotation), suggesting it was captured from the Kuiper Belt rather than forming in situ.
Answer: False
Roscosmos is the State Corporation for Space Activities of the Russian Federation. Ukraine has its own space agency, SSAU.
Answer: True
Unlike Jupiter and Saturn (gas giants dominated by hydrogen/helium), Uranus and Neptune contain higher proportions of 'ices' (water, ammonia, methane), hence termed ice giants.
Answer: True
The CMB is remarkably isotropic (uniform) at 2.725 K, with minute anisotropies (~1 part in 100,000) that seeded the formation of cosmic structures.
Answer: True
Eris, discovered in 2005, is slightly more massive than Pluto, prompting the IAU to redefine 'planet' and create the 'dwarf planet' category.
Answer: True
After 15 years in orbit, Mir was deliberately deorbited in March 2001, with debris falling into the South Pacific Ocean.