I. What is Perihelion? Perihelion is a term used in astronomy to describe the point in an object’s orbit around the sun when it is closest to the sun. The word itself comes from the Greek words “peri,” meaning near, and “helios,” meaning sun. This phenomenon occurs in the elliptical orbits of planets, comets, and … Read more
What is VLTI (Very Large Telescope Interferometer)? The Very Large Telescope Interferometer (VLTI) is an astronomical interferometer operated by the European Southern Observatory (ESO) in Chile. It is located at the Paranal Observatory in the Atacama Desert, one of the best locations for astronomical observations due to its clear skies and minimal light pollution. The … Read more
What is a Lunar Eclipse? A lunar eclipse occurs when the Earth passes between the Sun and the Moon, casting a shadow on the Moon. This phenomenon can only happen during a full moon when the Sun, Earth, and Moon are aligned in a straight line. Unlike a solar eclipse, which can only be seen … Read more
I. What is the Flatness Problem in Cosmology? The flatness problem in cosmology refers to the mystery surrounding the nearly flat geometry of the universe. According to the theory of general relativity, the geometry of the universe is determined by the amount of matter and energy it contains. If the universe has a certain critical … Read more
I. What is Electric Propulsion? Electric propulsion is a type of propulsion system that uses electrical energy to accelerate propellant and generate thrust. Unlike traditional chemical propulsion systems that rely on the combustion of propellant, electric propulsion systems use electric power to ionize propellant and accelerate the ions to produce thrust. This technology has gained … Read more
I. What is Gamma-Ray Astronomy? Gamma-ray astronomy is a branch of astronomy that focuses on the study of gamma rays, which are the most energetic form of electromagnetic radiation in the universe. Gamma rays are produced by some of the most extreme and violent events in the universe, such as supernovae, black holes, and gamma-ray … Read more
I. What is Radial Velocity Method? The Radial Velocity Method, also known as the Doppler Method, is a technique used by astronomers to detect and measure the presence of exoplanets orbiting distant stars. This method relies on the observation of changes in the radial velocity of a star caused by the gravitational pull of an … Read more
I. What is a Coronal Mass Ejection (CME)? A Coronal Mass Ejection (CME) is a massive burst of solar wind and magnetic fields rising above the solar corona or being released into space. These ejections can contain billions of tons of solar material and can travel at speeds of up to several million miles per … Read more
What is a Binary Asteroid? A binary asteroid is a type of asteroid that consists of two separate objects that are gravitationally bound together. These objects orbit around a common center of mass, similar to a binary star system. Binary asteroids are quite common in our solar system, with estimates suggesting that around 15% of … Read more
I. What are Titan’s hydrocarbon lakes? Titan, Saturn’s largest moon, is known for its unique and fascinating features, one of which is its hydrocarbon lakes. These lakes are composed of liquid methane and ethane, making them quite different from the water bodies we are familiar with on Earth. Titan’s lakes are found near the poles, … Read more