Presentation on theme: "T.O.C: Telescopes Allow us to Study Space from Earth"— Presentation transcript:
1 T.O.C: Telescopes Allow us to Study Space from Earth Ch. 1 Lesson 1.2How do telescopes work?T.O.C:Telescopes Allow us to Study Space from Earth
2 Telescopes Capture Light Light is a form of radiation that carries info from spaceElectromagnetic radiation (EMR)w.w- energy that travels across distances as certain types of waves.Travels in all directions thru spaceAlmost everything we know about the universe came from the study of this radiation!Can tell size, distance, & mvmt of object by its radiation as well as what it’s made of & how it’s changed!So, how does light allow us to “see” an object then?Light reflects from object & travels to your eyes. Your eyes gather light from the object you’re looking at!
4 The Electromagnetic Spectrum w.w All forms of electromagnetic radiationIn order from longest radiation wave to shortest: radio waves, microwaves, infrared, visible (white), ultraviolet, x-rays, gamma raysAbout White/Visible Light– prism/flashlight demoA tiny part of the electromagnetic spectrumWe can see it, but we see it in colors…Spectrum(w.w) these colors make up visible light, in order of wavelength- long to short- Red, orange, yellow, green, blue, indigo, violet. (rainbow)Wavelength(w.w)- distance between one wave peak to the next wave peak.
7 Telescopes (w.w)Galileo Galilei- 1609/1610- created 1st telescope. Supported Copernicus belief of Sun as center of universe. Discovered moon craters & Jupiter’s 4 large moons.Device that gathers EMRSome gather visible light (mine) to provide clear images than what is seen w/ your eyesOthers show radiation that our eyes can’t seeAstronomers use telescopes to gather info about spaceDifferent colors/shades reveal patterns of radiationMost gather info w/ a glass lense or reflecting surface (like a mirror) & data is gathered electronically.
8 2 Types of Visible-Light Telescopes Reflecting- has curved mirror that reflects lightCan be built to gather infrared or ultraviolet radiationImage focuses on mirror & reflects to eyepieceEx: mineRefracting- has curved piece of glass at one end of a long tubeGathers light & focuses it to form image at other end of tubeEyepiece magnifies imagesThe most powerful telescopes are built on mountain tops in rural areas. Why is this?Less light from city, less interference w/ our atmosphere b/c less air (air mvmt in atmosphere causes the stars to “twinkle”)
9 Radio TelescopesShows where radio waves are being emitted by space objectsHas curved metal surface called a dish (think satellite) that gathers radio waves & focuses them on an antennae which is connected to computers that receive the incoming dataSo big b/c radio waves are so long!A group of these pointed at one object can show more detail than the largest satellite dish.Not affected by clouds, bad weather, etc. b/c radio waves pass thru Earth’s atmosphere freely.
11 Telescopes in SpaceHubble Space Telescope (see pic)- reflecting telescope.Placed in Earth’s orbit in 1990 & is operated from EarthSends images/data to Earth electronicallyVery clear images of space b/c it’s IN space (no atmosphere)Collects visible, ultraviolet, & infrared radiation imagesJust a part of a group of telescopes that orbit Earth & allow astronomers to gain info from electromagnetic spectrum.Spectroscope Lab- Page 21- create table in NotebookNeed: spectroscopes, flashlight (2), fluorescent lamp (2), blacklight, sunlightStudents in groups. DO: “Observe & Analyze” #1 & “Conclude” #1, 2, 3
12 1.2 Review Q’s 24 pts What is electromagnetic radiation (EMR)? (2 pts) What form of EMR is particularly important for humans? Why? (2 pts)List the forms of electromagnetic radiation in order from longest to shortest wavelength. (7 pts)List the visible light spectrum in order from longest to shortest wavelength. (7 pts)Explain how radio telescopes work. (3 pts)Explain how/why Galileo Galilei’s invention of the telescope was important for science. (3 pts)