Astronomy and Space Science Quiz

Omega Centauri is the largest and brightest globular cluster in the Milky Way, visible to the naked eye. Located about 15,800 light-years away, it contains several million stars and spans about 150 light-years across, making it exceptional among globular clusters.

Ganymede is Jupiter's largest moon and the largest moon in our solar system, with a diameter of 5,268 km - even larger than the planet Mercury. It's the only moon known to have its own magnetic field and may have a subsurface ocean beneath its icy crust.

Ceres is the largest object in the asteroid belt between Mars and Jupiter, with a diameter of about 940 km. It accounts for about one-third of the total mass of the asteroid belt and is classified as both an asteroid and a dwarf planet since 2006.

The Effelsberg 100-m Radio Telescope near Bonn, Germany, is the world's largest fully steerable radio telescope. Completed in 1971, it can observe the entire sky and operates across multiple radio wavelengths for astronomical research.

Plaskett's Star is a binary star system with a combined mass of about 116 times that of the Sun, making it one of the most massive stars known. Located in the constellation Monoceros, it consists of two massive O-type stars orbiting each other.

Orion's Belt (also called the Three Kings) consists of three bright stars: Alnitak, Alnilam, and Mintaka. These blue supergiant stars are easily visible in the night sky and form a distinctive straight line that is one of the most recognizable asterisms in the constellation Orion.

Svetlana Savitskaya was the first woman to perform a spacewalk in 1984 during the Soyuz T-12 mission. Valentina Tereshkova was the first woman in space (1963) but did not perform a spacewalk. Sunita Williams and Mary Cleave conducted spacewalks much later.

Bruce McCandless II became the first astronaut to perform an untethered spacewalk in 1984 using the Manned Maneuvering Unit (MMU) during Space Shuttle mission STS-41B. This allowed free flight without any tether connection to the spacecraft.

John Glenn became the first American to orbit Earth on February 20, 1962, during the Friendship 7 mission. He completed three orbits around the planet, marking a milestone in the Space Race.

Venus has the nearly circular orbit among all planets with an eccentricity of approximately 0.007. Mercury has the most eccentric orbit (0.206), while Mars (0.094) and Uranus (0.047) have more elliptical orbits than Venus.

Edwin Hubble provided the first evidence for the expansion of the universe in the 1920s by observing that distant galaxies were moving away from us, with their redshift increasing with distance. This relationship became known as Hubble's Law.

Aryabhatta I, the ancient Indian astronomer and mathematician from the 5th century CE, was the first to propose that Earth rotates about its axis. He explained that this rotation causes day and night, predating similar understanding in Western astronomy.

In the Bayer designation system for stars in a constellation, Greek letters are assigned in order of brightness: alpha is brightest, beta is second brightest, gamma is third brightest, and so on. Therefore, gamma represents the third brightest star.

Oology is the branch of ornithology (study of birds) that specifically focuses on the study of bird eggs, including their anatomy, development, and nesting patterns. It is a specialized scientific term derived from the Greek word 'oon' meaning egg.

A hygrometer is the scientific instrument specifically designed to measure relative humidity in the atmosphere. A barometer measures air pressure, while a thermometer measures temperature. 'Humidmeter' is not a standard scientific instrument.

Marie and Pierre Curie discovered radium in 1898 while studying pitchblende, a uranium-rich ore. Frederick Soddy worked on radioactive decay theory but did not discover radium. Michael Radium is not a known scientist, and Enrico Fermi was a nuclear physicist who came decades later.

Galileo discovered the isochronism of the pendulum in 1583 - that a pendulum's period depends only on its length, not the amplitude of swing. The telescope was his invention, not a discovery. Distoscope is not a real scientific instrument, and alarm clocks are unrelated to Galileo's work.

Aristotle is often called the father of biology for his systematic classification and study of over 500 animal species. Robert Hooke discovered cells but came much later (17th century). J.C. Bose worked on plant physiology in modern times, and Enrico Fermi was a nuclear physicist.

Oxygen has 8 protons in its nucleus, giving it atomic number 8. Carbon has atomic number 6, sulfur has 16, and germanium has 32. The atomic number defines an element and equals its proton count.