Space Physics
Accretion disc: Initially the cloud and dust from the nebula started to move closer and
gravitational pull started to increased causing the clouds to collapse. Which made it to
spin faster eventually forming an accretion disc.
An object with elliptical orbit will travel faster when closer to the Sun because near the Sun
the gravitational attraction will be higher. So, according to conservation of energy theorem
energy can’t be neither created nor destroyed, it can only change from one form to another
the gravitational energy will be converted to kinetic energy of the planet.
Redshift is the increase in the observed wavelength of electromagnetic radiation emitted
from receding stars and galaxies. Speed v at which a galaxy is moving away from the Earth
can be found from the change in wavelength of the galaxy’s starlight due to redshift
Distance of a far galaxy d can be determined using the brightness of a supernova in that
galaxy