Aim: Tools of Astronomy Do Now: List 4 tools that a chief may use DO NOW: What is this picture showing you? Notepack 21

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.