Big Bang Cosmology, Stars & Galaxies

These flashcards are designed to help students remember key concepts related to Big Bang cosmology, star formation, agrarian civilizations, and the evolution of human societies.

What landmark event marks the beginning of space and time in the universe?

The Big Bang, approximately 13.77 billion years ago.

What were the first two elements formed after the Big Bang?

Hydrogen and Helium.

What are the four fundamental forces that emerged after the Big Bang?

Gravity, electromagnetism, strong nuclear forces, weak nuclear forces.

What is the Cosmic Microwave Background Radiation (CMB)?

A faint glow of light that fills the universe, representing the afterglow of the Big Bang.

What conditions were necessary for the formation of stars according to the lecture notes?

Tiny variations in the density of matter, gravity, and extremely high temperatures.

What is a protostar?

A star that has not yet reached the fusion stage and grows by accretion.

What significant astronomical event is predicted to happen to the Milky Way galaxy in 4 billion years?

It is predicted to collide with the Andromeda galaxy.

How does the lecture classify the organizational structure of the Universe?

Stars, solar systems, galaxies, clusters, superclusters.

What is the importance of gravity in the formation of stars and galaxies?

Gravity is the fundamental force that drew particles of matter together to initiate star formation.

What is the definition of a star according to the lecture?

A celestial body that shines due to nuclear reactions producing light and heat.

What is a significant outcome of the discovery of Cosmic Background Radiation?

It confirmed the plausibility of the Big Bang Theory, making the Steady State Theory implausible.

What is the primary role of elders in hunter-gatherer societies?

Elders pass on knowledge about hunting, foraging, and survival.

What was the primary diet of Paleolithic forager societies?

Mainly plants, roots, nuts, insects, and small animals supplemented by fishing and hunting.

What is considered a hallmark of the Neolithic Era?

The development of agriculture and permanent settlements.

What are the four world zones mentioned in the lecture?

Afro-Eurasia, The Americas, Australasia, The Pacific.

What major climate shift is noted in the context of agricultural development?

The Holocene epoch marked by a warmer climate and more reliable rainfall.

What were the effects of agriculture on human societies as discussed in the lecture?

Increased food production, higher population densities, and the emergence of social stratification.

What is the significance of the Code of Hammurabi mentioned in the lecture?

It served as one of the earliest records of law, emphasizing social order and justice.

What marking characterized the transition from Paleolithic to Neolithic societies?

The shift from foraging to farming and establishment of sedentary communities.