Early and modern theories

Sun at the center and planet formation in the disk identify the modern solar nebula model. In exams, read clues in sequence.

In science, theories change with evidence and better explanation. In exams, understand science as an evidence-based process.

The solar nebula theory relates to the origin of the solar system. In exams, identifying the scale of a theory is necessary.

Cosmic background radiation is evidence for the Big Bang theory. In exams, be careful while identifying incorrect pairs.

Water vapour cooled and condensed, making water bodies possible. In exams, remember the sequence from vapour to water.

Small particles first join and then gravity helps form larger bodies. In exams, understand the sequence from tiny to large.

The asteroid belt is linked with leftover construction material of the solar system. In exams, treat it as a remnant region.

Matter gathers due to gravity and forms large cosmic structures. In exams, connect structure formation with gravity.

Light elements were part of the early chemical evolution of the universe. In exams, remember basic matter before large bodies.

The Big Bang explains the broad cosmic beginning, but Earth's internal layers formed by differentiation. In exams, connect the correct process with the correct scale.

One model can explain many facts such as orbits and planetary composition. In exams, consider multi-fact explanation as strength.

The tidal theory assumes matter was pulled from the Sun by gravity of an external star. In exams, a passing star is the major clue.

Gas-dust cloud, collapse, and flat disk are clues of the modern solar nebula model. In exams, identify the clue words.

The sequence starts with the universe, then galaxies, then the solar system, and then Earth's development. In exams, remember the order from larger to smaller scale.

Modern theories are more supported by observations and physical laws. In exams, mention evidence basis while comparing.

Cosmic background radiation became a major challenge for the steady state theory. In exams, identify limitations through evidence.

During gravitational collapse, matter concentrated at the center and planet material remained in the disk. In exams, identify the roles of center and disk separately.

Frost line and temperature gradient explain compositional differences of planets. In exams, connect inner and outer planets with these.

The solid crust provided a base for water retention and ocean development. In exams, remember the relation between crust and hydrosphere.

Release of internal gases was important for the early atmosphere. In exams, treat outgassing as the main process.

Red shift indicates receding galaxies and is evidence of expansion. In exams, write reasoning from evidence to conclusion.

Red shift is evidence of cosmic expansion, not the cause of Earth's layers. In exams, match the process with the topic correctly.

The modern solar nebula model is more accepted today for the origin of the solar system. In exams, mention the match of evidence and processes as the reason.

This idea is historical but weak in explaining ordered planetary motion. In exams, remember the limitation of old collision theories.

Kant emphasized gravitational concentration of scattered gaseous matter. In exams, connect gravity with nebular development.