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Superrotation in Venus's atmosphere means winds circle the planet faster than its rotation period.
- True - 60x faster
- False - slower than rotation
- True - same speed
- False - no winds exist
Answer: True - 60x faster
Venusian cloud-top winds reach 100 m/s, circling planet in ~4 days versus 243-day rotation, driven by thermal tides and wave-mean flow interactions.
Which cosmonaut holds the record for longest cumulative time in space?
- Valeri Polyakov
- Gennady Padalka
- Sergei Krikalev
- Oleg Kononenko
Answer: Oleg Kononenko
Oleg Kononenko surpassed 1,000 days in space in Feb 2024 across five missions, holding current cumulative duration record.
The NEO Surveyor mission will detect potentially hazardous asteroids using which wavelength?
- Visible
- Infrared
- Ultraviolet
- Radio
Answer: Infrared
NEO Surveyor uses infrared detectors to find dark asteroids missed by optical surveys, identifying PHAs >140 m within 5 years of launch.
Shield volcanoes on Mars differ from terrestrial ones primarily in which aspect?
- Composition
- Size and longevity
- Eruption style
- Tectonic setting
Answer: Size and longevity
Martian shield volcanoes (e.g., Olympus Mons) are vastly larger due to stationary crust over mantle plumes, allowing prolonged eruptions without plate tectonics.
The first space tourist was Dennis Tito who visited the ISS in which year?
- 1999
- 2001
- 2003
- 2005
Answer: 2001
American businessman Dennis Tito paid ~$20M to fly aboard Soyuz TM-32 to ISS in Apr-May 2001, inaugurating commercial space tourism era.
Which space agency operates the Spektr-RG X-ray observatory?
- NASA
- ESA
- Roscosmos
- CNSA
Answer: Roscosmos
Spektr-RG (launched 2019) is Russian-German mission mapping X-ray sky with eROSITA/ART-XC telescopes, discovering millions of AGNs and clusters.
Which mission returned lunar samples from the Oceanus Procellarum region in 2020?
- Chang'e 4
- Chang'e 5
- Hayabusa2
- OSIRIS-REx
Answer: Chang'e 5
Chang'e 5 collected 1.731 kg of basaltic regolith from Mons Rümker in Oceanus Procellarum, youngest lunar samples (~2 Ga) filling age gap.
Fast Radio Bursts (FRBs) are millisecond-duration radio pulses originating from which type of source?
- Supernovae
- Magnetars
- Active galactic nuclei
- Pulsar glitches
Answer: Magnetars
FRB 200428 linked to Galactic magnetar SGR 1935+2154 confirmed magnetars as FRB sources, though extragalactic FRBs may have diverse origins.
Earth trojan asteroids occupy which Lagrange points relative to Earth-Sun system?
- L1 and L2
- L3 only
- L4 and L5
- L1, L2, L3
Answer: L4 and L5
Earth trojans librate around L4 (leading) and L5 (trailing) points; 2010 TK7 (L4) and 2020 XL5 (L4) are confirmed examples.
Which space shuttle mission deployed the Chandra X-ray Observatory?
- STS-93
- STS-109
- STS-125
- STS-61
Answer: STS-93
Columbia's STS-93 mission (July 1999) deployed Chandra, the most powerful X-ray telescope, studying high-energy cosmic phenomena.
ISRO's POEM platform repurposes which spent stage for microgravity experiments?
- PSLV fourth stage
- GSLV cryogenic stage
- LVM3 core stage
- SSLV terminal stage
Answer: PSLV fourth stage
PSLV Orbital Experimental Module (POEM) uses depleted PS4 stage as stabilized platform hosting payloads for weeks/months post-primary mission separation.
The Caloris Basin is a massive impact feature on which celestial body?
- Moon
- Mars
- Mercury
- Vesta
Answer: Mercury
Caloris Basin (~1,550 km diameter) formed from a giant impact early in Mercury's history, causing antipodal chaotic terrain from seismic focusing.
The first successful docking of two spacecraft occurred between which vehicles?
- Gemini 8 & Agena
- Apollo 9 & LM
- Soyuz 4 & 5
- Vostok 3 & 4
Answer: Gemini 8 & Agena
Neil Armstrong and David Scott docked Gemini 8 with Agena Target Vehicle on Mar 16, 1966, achieving first orbital docking despite subsequent emergency undocking.
Which space agency operates the Gaofen series of high-resolution Earth observation satellites?
- NASA
- ESA
- CNSA
- Roscosmos
Answer: CNSA
Gaofen ('High Resolution') satellites form China's CHEOS system, providing sub-meter imagery for civilian/military applications since 2013.
The Copernicus Sentinel satellites are operated by which organization?
- NASA
- ESA/EUMETSAT
- JAXA
- NOAA
Answer: ESA/EUMETSAT
Sentinel constellation provides free/open Earth observation data for environmental monitoring, managed jointly by ESA and EUMETSAT under EU Copernicus program.
Gamma-ray bursts (GRBs) are classified into short and long duration based on which threshold?
- 1 second
- 2 seconds
- 10 seconds
- 60 seconds
Answer: 2 seconds
Short GRBs (<2 s) originate from compact object mergers; long GRBs (>2 s) from collapsars/massive star deaths, differing in progenitors and host galaxies.
Titan's atmosphere is predominantly composed of which gas?
- Carbon dioxide
- Nitrogen
- Methane
- Argon
Answer: Nitrogen
Titan's dense atmosphere is ~95% nitrogen with ~5% methane, resembling early Earth's composition but at cryogenic temperatures.
Which Apollo mission carried the first lunar rover?
- Apollo 11
- Apollo 14
- Apollo 15
- Apollo 17
Answer: Apollo 15
Apollo 15 (July-Aug 1971) deployed the first Lunar Roving Vehicle, extending exploration range beyond walking distance and collecting diverse samples.
Voyager 1 crossed the heliopause into interstellar space in which year?
- 2004
- 2012
- 2018
- 2021
Answer: 2012
Voyager 1 crossed the heliopause on Aug 25, 2012, becoming the first human-made object to enter interstellar space, confirmed by plasma density jump.
Shepherd moons maintain planetary ring gaps through which mechanism?
- Magnetic confinement
- Gravitational resonances
- Electrostatic forces
- Radiation pressure
Answer: Gravitational resonances
Small moons like Prometheus and Pandora gravitationally confine Saturn's F ring, preventing particle dispersion through orbital resonances.