Exam (elaborations)
NST1502 ASSIGNMENT 3 2023
- Course
- NST1502 (NST1502)
- Institution
- University Of South Africa (Unisa)
NST1502 ASSIGNMENT 3 2023
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NST1502ASSIGNMENT 3
2023
ASSIGNMENT 3 NST1502 2023
, Assignment 03 (100 Marks)
QUESTION 1
Define the following terms:
1.1 Planet
The definition of planet has changed several times since the word was coined by
the ancient Greeks. Greek astronomers employed the term ἀστέρες
πλανῆται (asteres planetai), 'wandering stars', for star-like objects which apparently
moved over the sky. Over the millennia, the term has included a variety of
different celestial bodies, from the Sun and the Moon to satellites and asteroids.
1.2 Oort cloud
The Oort Cloud is a predicted collection of icy objects farther away than everything
else in the solar system. It fits with observations of comets in the planetary region of
the solar system, but scientists have yet to observe any object in the Oort Cloud
itself.
1.3 Solar system
Solar system: A set that includes a star and all of the matter that orbits it, including
planets, moons, asteroids, comets, and other objects. Solar wind: The constant
stream of particles and energy emitted by the sun. Space weather: The conditions in
space that can affect Earth, satellites, and space travel.
1.4 Galaxy
A galaxy is a huge collection of gas, dust, and billions of stars and their solar
systems, all held together by gravity. We live on a planet called Earth that is part of
our solar system.
1.5 The moon
the large round object that circles the Earth and that shines at night by reflecting light
from the sun.
1.6 Atmosphere
the envelope of gases surrounding the earth or another planet. "part of the sun's
energy is absorbed by the earth's atmosphere"
1.7 Earth
Earth is a terrestrial or inner planet consisting of a thin outer crust, an intermediate
mantle, and a dense inner core. It has an atmosphere composed primarily of
nitrogen and oxygen and is the only planet on which water in liquid form exists,
covering more than 70 percent of its surface.
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