Tag: science & technology

Hubble's Law states that galaxies are moving away from us at speeds proportional to their distance - more distant galaxies recede faster. This was key evidence for the expanding universe and Big Bang theory. Kepler's laws describe planetary motion, Huygens studied wave theory, and Friedmann developed cosmological models.

A quasar is an extremely luminous active galactic nucleus powered by a supermassive black hole. They emit enormous energy across the electromagnetic spectrum, especially in radio frequencies. Pulsars and neutron stars are different objects - rotating stellar remnants, not galactic nuclei.

Olympus Mons on Mars is the tallest volcano and mountain in the solar system at about 22 km (13.6 miles) high - nearly 3 times Mount Everest's height. It's a massive shield volcano. Stromboli is in Italy, Fujiyama is in Japan, and Orcus is not a known major volcano.

Black holes have such intense gravitational field due to their extremely high density (mass concentrated in a tiny volume) that nothing, not even radiation or light, can escape from beyond the event horizon. The escape velocity exceeds the speed of light. The size of a black hole (event horizon) depends on its mass, but the key property is the density. Small or large size alone doesn't create a black hole - it's the mass-to-volume ratio (density) that matters.

Dr. Christiaan Barnard performed the world's first human-to-human heart transplant on December 3, 1967 at Groote Schuur Hospital in Cape Town, South Africa. The patient, Louis Washkansky, lived for 18 days after the pioneering surgery.

Ganymede is the largest moon in our solar system and orbits Jupiter. It was discovered by Galileo Galilei in 1610 along with three other Jovian moons. Ganymede is even larger than the planet Mercury and is the only moon known to have its own magnetic field, suggesting a subsurface ocean beneath its icy surface.

Oparin proposed the theory of chemical evolution of life (primordial soup theory) in 1924, suggesting that organic compounds could form from inorganic precursors through natural chemical reactions. This was a foundational hypothesis for understanding the origin of life on Earth. Darwin focused on natural selection, Lamarck on inheritance of acquired characteristics, and Haeckel on embryology and recapitulation theory.

Ole Rømer was the first to measure the speed of light in 1676 by observing Jupiter's moon Io. He noticed that the timing of Io's eclipses varied depending on Earth's distance from Jupiter, allowing him to calculate light's finite speed. Galileo and Newton contributed to optics but didn't measure light speed. Einstein's work came much later.

Uranus was discovered by William Herschel in 1781. While the spelling in option A is 'Hershel' instead of 'Herschel', this is clearly referring to the correct discoverer. The other options are all incorrect - Ganleo appears to be a misspelling or fictitious name, Copernicus lived centuries before Uranus was discovered, and 'None of these' is incorrect since Herschel did discover it.

Meteorology is the scientific study of the atmosphere and weather phenomena. Despite the similar name, it has nothing to do with meteors (which are studied under astronomy), metals, or earthquakes. Option A 'weather' is the correct answer as meteorologists study atmospheric conditions and weather patterns.