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Explore our extensive collection of questions and answers to enhance your learning experience and prepare for exams effectively

In 2012, WMAP estimated the age of the universe to be 13.772 billion years, with an uncertainty of 59 million years. In 2013, Planck measured the age of the universe at 13.82 billion years.

Redshift and blueshift describe how light changes as objects in space (such as stars or galaxies) move closer or farther away from us. … When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longe

In 1801, while making a star map, Italian priest and astronomer Giuseppe Piazzi accidentally discovered the first and largest asteroid, Ceres, orbiting between Mars and Jupiter

The Crab Nebula is a supernova remnant in the constellation of Taurus.

The common name comes from William Parsons, 3rd Earl of Rosse, who observed the object in 1840 using a 36-inch telescope and produced a drawing that looked somewhat like a crab.
Corresponding to a bright supernova recorded by Chinese astronomers in 1054, the nebula was observed later by English astronomer John Bevis in 1731.

The nebula was the first astronomical object identified corresponding to a historical supernova explosion.

Currently, Andromeda and the Milky Way are about 2.5 million light-years apart. Fueled by gravity, the two galaxies are hurtling toward one another at 402,000 kilometers per hour. But even at that speed, they won’t meet for another four billion years

In 1609, using this early version of the telescope, Galileo became the first person to record observations of the sky made with the help of a telescope. He soon made his first astronomical discovery. Galileo spacecraft image of Earth and its moon

Siphons do not work exclusively because of gravity, siphons also rely on background pressure. If you have cavitation of your fluid within the siphon tube, it ceases to work properly.

In the open pico-atmopshere/fempto-atmosphere of the moon, it is impossible for any liquid to exist, and even if liquid did exist…there wouldn’t be any significant background air pressure to push the liquid up over the top of the siphon tube, and your trick wouldn’t work.

In astronomy, Kepler’s laws of planetary motion are three scientific laws describing the motion of planets around the Sun.
1. The orbit of a planet is an ellipse with the Sun at one of the two foci.
2. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.
3. The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.

comets orbit is a result of an object falling towards the sun. Unlike asteroids, which formed in the inner solar system and have a reasonably circular orbit like the planets, comets formed far away from the sun and are the frozen gases and dust of the early solar system

Infrared radiation is emitted by any object that has a temperature (ie radiates heat). So, basically all celestial objects emit some infrared. The wavelength at which an object radiates most intensely depends on its temperature. In general, as the temperature of an object cools, it shows up more prominently at farther infrared wavelengths. This means that some infrared wavelengths are better suited for studying certain objects than others.

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