Transcript File - Mr. LaFranca`s Earth Science Class

Notepack 21
Aim: Tools of Astronomy
Do Now: List 4 tools that a chief may use
DO NOW: What is this picture showing you?
How do people study the Universe?
• For thousands of
years people have
been looking up at
the sky and making
observations.
• Observations allow
use to study and infer
things and events
that are in the sky.
TYPES OF CELESTIAL OBJECTS
Galaxies: a collection of stars “milky way”-our galaxy
Star: An object that shines through the release of energy
produced by nuclear reactions at its core.
Nebula: is a huge, diffuse cloud of gas and dust in space
Planet: A celestial body moving in an elliptical orbit
around a star.
Comet: A small, frozen mass of dust and gas revolving
around the sun.
Moon: small rocky bodies that orbit a planet
Asteroid: small rocky objects that do not orbit a planet
Instruments that we use to observe
the sky?
• Sextant is a tool used to determine detail
measurements of a celestial body’s (planet or
star) distance above the horizon.
Instruments that we use to observe
the sky? (cont)
• Telescopes are tools used to look at celestial
bodies (planet or star) and see details that we
cannot see from Earth.
• Telescopes use light that come from an object.
Instruments that we use to observe
the sky? (cont)
• Radio Telescope is a tool that uses radio waves to
look at celestial bodies.
• These radio waves are than interrupted by a
computer to produce an image.
Instruments that we use to
observe the sky? (cont)
• Inferred telescopes or ultraviolet Imaging
Systems use wave lengths the human eye
cannot see and create detail images of
celestial bodies.
Instruments that we use to
observe the sky? (cont.)
• Spectrograph is an instrument that takes a
photographic record (picture) of a celestial
object.
• It studies the composition of the stars by color
that it emits (lets off)
• Stars that emit blue light are said to be very
hot.
• Stars that emit red light are said to be cool.
• Yellow light (like our Sun) is medium in
temperature.
Instruments that we use to
observe the sky? (cont.)
• Satellites are instruments that scientist send to
celestial bodies that orbit them and collect
information using a variety of tests.
• Probes are instruments that physically make
contact with an object (landing on or sampling)
and collect data using a variety of tests.
http://www.youtube.com/watch?v=HEheh1BH34Q&feature=related