ASTRONOMY

The scientific study of the stars and other objects in space is called astronomy. Astronomers observe the Universe using telescopes, which focus light from distant objects and make them clearer. Different types of telescope also reveal rays of light that are invisible to the human eye. On the ground, radio telescopes capture radio waves. Telescopes in space study rays that cannot pass through Earth’s atmosphere.

GIANT TELESCOPES

The Hale Telescope at Palomar Observatory in California, USA, was completed in 1948, and was the first giant telescope. It has a light-gathering mirror 508 cm (200 in) across. There are two types of telescope that study light. Reflecting telescopes capture light with a mirror, and refracting telescopes use a lens. All modern professional telescopes are reflectors.

BIOGRAPHY: GALILEO Italian, 1564-1642

Galileo was a physicist, mathematician, and an astronomer. In 1609 he built a telescope and became the first person to use one to look at the heavens. He saw mountains on the Moon, spots on the Sun, observed the phases of Venus, and discovered Jupiter’s four large moons. In later life, his support for the view of Copernicus that Earth and the planets circle round the Sun brought him into conflict with the Church.

Copyright © 2007 Dorling Kindersley

highlights

Teens and E-Cigarettes: 6 Things You Must Know
For the first time in a generation, tobacco use has risen among the nation's youth, due to the rising use of e-cigarettes. Learn more about the dangerous and addictive e-cigarette trend, and get tips to talk to your teen.

Find Today's Newest & Best Children's Books!
Looking for newly released books for your child? Try our new Book Finder tool to search for new books by age, type, and theme, brought to you by Galactic Hot Dogs.

Printable Lists of the Top 100 Baby Names
Need help with baby name ideas? Use our printable list of the top 100 girl names and top 100 boy names of 2015 to help you brainstorm and narrow down your favorites.

Registered for Kindergarten — Now What?
Wondering what to do now that you've signed your child up for kindergarten? Try our award-winning Kindergarten Readiness app! This easy-to-use checklist comes with games and activities to help your child build essential skills for kindergarten. Download the Kindergarten Readiness app today!

stay connected

Sign up for our free email newsletters and receive the latest advice and information on all things parenting.

Enter your email address to sign up or manage your account.

Facebook icon Facebook icon Follow Us on Pinterest

editor’s picks