TeacherVision - Lesson Plans, Printables and more Free Trial  Member Benefits  Sign In    
Click Here
Feb 28, 2015
Search:   
We have merged TeacherVision's international content onto one website. Educators around the world can use TeacherVision.com to browse an extensive library of teaching materials. You can still find relevant content for Australia, Canada, the United Kingdom, and the United States in our Educators' Calendars.  [x] CLOSE
Mathematics (5210 resources)
|
 

Telescopes


Have you ever looked through a telescope at the night sky? Stars, moons, and planets become even more brilliant and distinct. Glancing up at the sky with our own eyes, we see only the tiniest fraction of the light that blazes from other stars and galaxies. Telescopes help us to focus that light and allow us to see more than we ever imagined was out there.

The first optical telescope was invented in the 1570's and consisted of one concave lens and one convex lens fitted inside a tube. The lenses refracted light and magnified objects two to four times. By 1609, the astronomer Galileo had developed a better model of the refracting telescope that magnified by about 20 times. With this instrument he saw that the moon, which many people thought was perfectly smooth, was actually covered with craters, peaks, and valleys! He also dicovered four of Jupiter's moons. Astronomy would never be the same.

The magnification of refracting telescopes could only be increased by lengthening the tube that contained the lenses. Thus, the father into space people wanted to see, the longer the telescope had to be. In 1671, Sir Isaac Newton invented a reflecting telescope, a vast improvement over the refracting model. Reflecting telescopes contain a parabolic mirror that reflects all the light that hits it back through a single point, the focal point. From the focal point, the concentrated light travels up the tube to a flat mirror that deflects it into the eyepiece. The length of the tube can be considerably shorter than that of a refracting telescope.

This reflecting technology has been incorporated into amazing machines like the Hubble Space Telescope. Hubble orbits the Earth on a satellite, and the view it gives us is undistorted by the Earth's atmosphere. The telescope weighs 12 tons, and its parabolic mirror is eight feet in diameter. Hubble has given us pictures of comets, galaxies, black holes, and of the birth of stars. Yet our wonder at these sights could not surpass the wonder Galileo must have felt when he looked through his own small telescope at the moon for the first time in human history.

Highlights

Galactic Hot Dogs Reading Marathon
Join the Galactic Hot Dogs Reading Marathon! Read each episode as it's re-released with newly revealed facts, behind-the-scenes illustrations, and the inside scoop. Make it official by pledging on the blog to read each chapter with Cosmoe. Your students will love following the exploits of these space travelers, and you'll love the educational elements that can easily be paired to the stories.

Handwashing Awareness
Kids are especially susceptible to contracting and spreading viruses during the winter months. Prevention starts with proper handwashing. Show students how to keep germs away.

March Calendar of Events
March is full events that you can incorporate into your standard curriculum. Our Educators' Calendar outlines activities for each event, including: National School Breakfast Week (3/2-6), World Orphan Week (3/4-11), Boston Massacre (3/5/1770), Daylight Saving Time Begins (3/8), International Women's Day (3/8), Teen Tech Week (3/8-14), Pi Day (3/14), St. Patrick's Day (3/17), Spring Begins (3/20), Make Your Own Holiday Day (3/26), and World Theatre Day (3/27). Plus, celebrate Deaf History Month (3/15-4/15), Music In Our Schools Month, Women's History Month, and Youth Art Month!

Poptropica Teaching Guides
Poptropica is one of the Internet's most popular sites for kids—and now it's available as an app for the iPad! It's not just a place to play games; each of the islands featured on the site provides a learning opportunity. Check out our teaching guides to four of Poptropica's islands: 24 Carrot Island, Time Tangled Island, Mystery Train Island, and Mythology Island.

Take Our Survey!
Help us improve TeacherVision by taking our brief survey. Thank you for your input!

Women's History Month
March is Women's History Month. Talk to your students about the accomplishments women have made—as well as the adversity they have faced.

Teaching with Comics
Reach reluctant readers and English-language learners with comics! Our original teaching guide to the Galactic Hot Dogs comic series, as found on Funbrain.com, will take students on a cosmic adventure while engaging their creative minds. Plus, find even more activities for teaching with comics, featuring many other classic stores.


Free 7-Day Trial for TeacherVision®

Sign up for a free trial and get access
to our huge library of teaching materials!
Start Trial