Einstein's Ultimate Laboratory
A recently discovered binary pulsar gives scientists the most rigorous test yet of general relativity.
By Michael Kramer
Glimpses of an Evolving Planet
A stroll through Earth's past gives astronomers vital clues to what terrestrial-sized exoplanets might look like.
By Jeff Hecht
In Perfect Focus
Modern imaging equipment demands the ability to focus with microscopic precision.
By Don S. Goldman & Barry B. Megdal
Dark Nights for the Perseids
Mark your calendar for meteor watching.
By Alan MacRobert
BEYOND THE PRINTED PAGE
Earth's Past and the Search for Habitable Planets
S&T's chief editor interviews two leading experts on what habitable planets might look like.
By Robert Naeye
ALSO IN THIS ISSUE
Amateur Astronomy's Southwestern Frontier
Long an observing paradise for professional astronomy, the American Southwest is sprouting new colonies of amateurs.
By Warren Keller
NEAF 2010: Bigger than Ever
You know spring has arrived when astronomers flock to Suffern, New York.
By Dennis di Cicco & Sean Walker
Modelling the 200-inch Telescope
With a little help from S&T readers, a Canadian amateur rekindles his fascination with a model of a 20th-century icon.
By Dan Ryan
Table of Contents
See what else August's issue has to offer.