Grade 12 Cosmology & Astronomy Worksheet
A comprehensive worksheet for Grade 12 students covering key concepts in cosmology and astronomy, including galaxy types, cosmic expansion, and stellar evolution.
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Grade 12 Cosmology & Astronomy
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Date:
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Read each question carefully and answer to the best of your knowledge. Show all calculations where applicable.
1. Which of the following best describes Hubble's Law?
The universe is contracting.
Galaxies are moving away from each other at a speed proportional to their distance.
Stars are powered by nuclear fusion.
The Earth orbits the Sun.
2. Which type of galaxy is characterized by a central bulge and spiral arms?
Elliptical galaxy
Spiral galaxy
Irregular galaxy
Lenticular galaxy
1. The Big Bang theory describes the origin and evolution of the .
2. Dark matter and dark energy are two mysterious components that make up a significant portion of the of the universe.
1. Describe the main differences between a red giant and a white dwarf star.
Observe the image below, which displays different types of galaxies. Identify and label each galaxy type.
Galaxy A:
Galaxy B:
Galaxy C:
1. The universe is approximately 4.5 billion years old.
True
False
2. All stars eventually become black holes.
True
False
Match the astronomical term with its definition.
1. Nebula
a. The remnant of a massive star that has collapsed under its own gravity.
2. Supernova
b. A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
3. Black Hole
c. A stellar explosion that briefly outshines an entire galaxy, radiating as much energy as the Sun is expected to emit over its entire life span.