Quiz 1
why is the sky blue in the daytime
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.
why is the cononal mass big
Coronal Mass Ejections (CMEs) are large expulsions of plasma and magnetic field from the Sun's corona. ... They expand in size as they propagate away from the Sun and larger CMEs can reach a size comprising nearly a quarter of the space between Earth and the Sun by the time it reaches our planet.
describe the gas star gas star cycle
During a star's lifetime, it fuses hydrogen into helium and helium into carbon. ... The interstellar medium cools, forms molecular clouds, and then forms new stars, which are made out of the material of the interstellar medium.
what cause a extinction of starlight
Interstellar Reddening. Dust grains along the line of sight scatter and absorb light coming from distant objects. ... These effects are known as extinction and interstellar reddening respectively. Dust grains in the interstellar medium have a typical size that is comparable to the wavelength of blue light.
what is interstellar reddening and extinction
interstellar reddening is a phenomenon associated with interstellar extinction where the spectrum of electromagnetic radiation from a radiation source changes characteristics from that which the object originally emitted.
21 cm wavelength
The hydrogen line, 21-centimeter line or H I line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms
desire reddening and extinction and how they happen
Reddening occurs due to the light scattering off dust and other matter in the interstellar medium. Interstellar reddening is a different phenomenon from redshift, which is the proportional frequency shifts of spectra without distortion.
what are the forbidden Spectral lines
is a spectral line associated with absorption or emission of light by atomic nuclei, atoms, or molecules which undergo a transition that is not allowed by a particular selection rule but is allowed if the approximation associated with that