25 Questions
According to the Nebular Hypothesis, how were the planets formed?
From a cloud of material associated with a youthful sun
Who developed the Nebular Hypothesis?
Immanuel Kant
What is the main component of the solar nebula according to the revised Nebular Hypothesis?
Hydrogen and helium along with dust
Who provided the first theory on the origin of the Universe?
Abbe Georges Lemaitre
Which theory explains the origin of the universe as an expanding universe hypothesis?
Big Bang Theory
Who revised the Nebular Hypothesis in 1950 along with Otto Schmidt?
Carl Weizascar
Which scientist provided evidence that the universe is expanding?
Edwin Hubble
What is the term used for the single point where all matter that formed the universe existed?
Singularity
What is the estimated age of the big bang event?
13.7 billion years ago
Which theory considered the universe to be roughly the same at any point of time and was eventually proven incorrect?
Steady State theory
What is the process by which dense regions within molecular clouds collapse under their own gravitational attraction and form stars called?
Star formation
What stage of star formation is an early stage where nuclear fusion is yet to begin?
Protostar
At which stage does a star's core temperature become high enough to start fusion reactions, fusing hydrogen atoms to form helium atoms?
Main Sequence Star
What occurs during the later stages of a star's evolution as it runs out of hydrogen fuel at its center?
Formation of Red Giant
What is formed when massive stars undergo explosive death, obtaining the brightness of 100 million suns for a short time?
Supernovae
What stage of star formation allows helium molecules to fuse at the core and prevents the core from collapsing?
Fusion of Heavier Elements
What celestial body orbiting around the sun, weighing for self gravity and nearly round in shape is called a dwarf planet?
Ceres
What is believed to be the result of a giant impact called 'big splat' that occurred approximately 4.44 billion years ago?
The formation of the moon
What were the main components of the early Earth's atmosphere?
Water vapor, carbon dioxide, nitrogen, methane, ammonia, and free oxygen
What process led to the release of gases from the interior of the Earth, thereby starting the evolution of the present atmosphere?
Degassing
Which layer of the Earth has the highest density?
Inner core
What significant event allowed life to expand from oceans to land?
The extinction of dinosaurs
During which geological period did reptiles dominate and replace amphibians?
Permian
What is the estimated age range for the Pre-Cambrian era?
5000 – 13,700 Million
What major event allowed oxygen to flood the atmosphere around 2,000 million years ago?
Photosynthesis in oceans
Explore the major early theories of the earth’s origin, including the Nebular Hypothesis proposed by Immanuel Kant and modified by Pierre Laplace. Delve into the concepts of planetary formation and the influence of a youthful sun and wandering stars.
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