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USA (1857 - 1923)
Best known for his discovery of Barnard's star in 1916, Edward Emerson Barnard was a gifted astronomer who grew up with little formal education. In 1876, he purchased his first telescope, a 5-inch refractor and discovered his first comet in 1881. In 1892, he discovered Amalthea, the fifth moon of Jupiter, making him the first to discover a new Jovian moon since Galileo in 1609. After joining Yerkes Observatory at the University of Chicago in 1895, Barnard spent great amounts of time photographing the Milky Way. Posthumously, his photographs were published in 1927 as A Photographic Atlas of Selected Regions of the Milky Way.





The Glass & Mirrors Toolkit

If you have access to some lenses and mirrors in your school science supply room, this set of demonstration activities will help your students understand more about how telescopes work, the differences between telescopes made with mirrors and those made with lenses, and how we are continuing the tradition of Galileo and Newton in building new telescopes today.

Big Questions

How do telescopes actually work?
Why are bigger telescopes better?
What’s the difference between telescopes made with lenses (refractors) and telescopes made with a mirror (reflectors)?
How are the telescopes of Galileo and Newton similar to telescope designs today?

Big Activity

Using a simple setup with lenses and mirrors, demonstrate how a telescope collects light, focuses it, and then magnifies the image.


Presenters: A minimum of one person.
Visitors: Up to 10 people at a time is appropriate.


About 15 minutes.

The Glass and Mirrors manual is a 34-page PDF file. Click here to download.

Contributed by Astronomical Society of the Pacific.




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