Astronomy and Cosmology

Microwaves are used in astronomy to study the cosmic microwave background radiation, which is the remnant radiation from the Big Bang.

The chemical composition of the solar system is not a potential discovery that could be made by the James Webb Space Telescope.

Neutron stars possess the strongest magnetic fields among stellar objects, with field strengths reaching up to 10^11 Tesla.

Stars are composed of plasma due to the high temperatures and pressures in their interiors, causing ionization of atoms.

The galactic center is the region at the center of a galaxy, where the density and temperature of the plasma are high, resulting in intense X-ray emission.

The stellar corona is the outermost layer of a star's atmosphere, characterized by high temperatures and densities, often exceeding millions of degrees Celsius.

Molecular clouds are dense regions of gas and dust in galaxies, where new stars are formed through gravitational collapse and subsequent nuclear fusion.

A supernova is a powerful explosion that occurs at the end of the life of a massive star, resulting in the ejection of a large amount of mass and energy.

The existence of dark matter is primarily inferred from the observed rotation curves of galaxies, which indicate that the mass of galaxies is significantly larger than the visible matter they contain.

The most widely accepted theory suggests that dark matter is composed of weakly interacting massive particles (WIMPs), which are hypothetical particles that interact very weakly with ordinary matter.

The primary goal of cosmological surveys in relation to dark matter and dark energy is to search for signatures of dark energy. By studying the large-scale structure of the universe, the expansion history, and the properties of galaxies and galaxy clusters, cosmologists aim to gain insights into the nature and properties of dark energy.

Gravitational lensing is a powerful technique employed by Indian astronomers to study galaxy masses. It involves the bending of light around massive objects, allowing astronomers to infer the mass of galaxies based on the distortion of background galaxies.

The NFW profile, named after its developers Navarro, Frenk, and White, is a theoretical model used to describe the mass distribution in elliptical galaxies. It assumes a density profile that decreases as a power law from the center of the galaxy.

Indian astronomers conducted extensive studies of the Coma Cluster, a massive galaxy cluster, to investigate the relationship between galaxy mass and X-ray luminosity. They found that the X-ray luminosity of galaxies within the cluster is correlated with their masses.

The Nearby Galaxies Survey, also known as the NGS, is a project undertaken by Indian astronomers to study the mass distribution in nearby galaxies. It involves observations using various telescopes to measure the masses of galaxies and investigate their structural properties.