SOLAR SYSTEM

Detailed explanation-1: -Interstellar dust grains start the process of condensation in the early solar nebula. True. While most large moons orbit counterclockwise above their planets’ equators, the smaller moons often show eccentric or even retrograde orbits, suggesting capture.

Detailed explanation-2: -The solar nebula is initially a thin gas of hydrogen and helium strewn with tiny dust particles. These tiny grains serve as the building blocks of the planets. Dust grains play an important role in the evolution of any gas cloud. These grains act as condensation nuclei, on which accretion of matter occurs.

Detailed explanation-3: -Why is dust important to the condensation sequence? Without dust, there would be nothing for the solar nebula gas to condense onto.

Detailed explanation-4: -Interstellar dust grains are typically hundredths to tenths of a micron size. They are composed of either carbon-rich (sooty) or silicate (sandy) material.

Detailed explanation-5: -Circumstellar discs are discs of dust, gas, asteroids and other objects that rotate around a star. Circumstellar discs around newly formed stars are known as protoplanetary discs.