introduction to astronomy snc 1d. astronomy astronomy is the study of the universe and its contents....
TRANSCRIPT
INTRODUCTION TO ASTRONOMY
SNC 1D
ASTRONOMY
• Astronomy is the study of the universe and its contents.
• Ex. examining the atmosphere of Mars
• People who watch the stars and outer space and people who study astronomy are called astronomers.
ASTROLOGY
• Astrology is the study of the movements of celestial bodies (sun, stars, moon) interpreted in terms of their effects on human affairs.• Ex. reading your horoscope
UNIVERSE
• The Universe comprises of everything we perceive to exist physically.
GALAXY
• A galaxy is a huge, rotating collection of stars, dust, planets, and other celestial objects within the universe.
• Our galaxy is the Milky Way containing more than billion stars.
CONSTELLATIONS
• A constellation is a group of stars in the sky that seem to form shapes that are recognized by humans.
STARS
• A star is a celestial body which gives off huge amounts of heat and light energy. • They are luminous objects.
(exception: black stars do not give off light).
SOLAR SYSTEM
• A solar system is made up of a sun and the objects (planets, moons, comets, and more) that orbit around it (travel around it).
PLANETS
• A planet is a nonluminous object that orbits a star (sun).• The Earth and Mars are
examples of planets.
MOONS
• A moon is a type of satellite: a celestial object that travels around a planet or dwarf planet.
ORBITS AND REVOLUTION
• The closed path of a celestial object or satellite as it travels around another, usually larger, celestial object is called an orbit.
• The time it takes for one orbit is the period of revolution or year.
ROTATION
• The time it takes for a celestial object to make one complete rotation around its axis is called the period of rotation or day
OUR PLACE IN THE UNIVERSE