SKY & TELESCOPE v.121 n.4 2011

ISSN 0037-6604

IN THE MAY 2011 ISSUE >

	Featured Articles

Gary Seronik

Orion's Robo Dobsonian Good things happen when Go To pointing meets a mass-market Dobsonian.  By Gary Seronik Spiinning Hearts of Darkness Astronomers are measuring the rotation rates of black holes to determine their formation and history.  By Laura Brenneman End of the Cosmic Dark Ages A novel radio array may be the first instrument to detect the elusive signal from the Epoch of Reionization  By Govert Schilling Residual Bulk Image: Cause and Cure Understanding the subtleties of your CCD camera will help you create better images.  By Richard Crisp

	Beyond the Printed Page

Drama at Dawn This May the most compact visible grouping of four bright planets in decades can be glimpsed low in bright dawn. The thin crescent Moon joins the show at the beginning and end of the month. Click here to see an animation of the four-planet dance.    read more > By Fred Schaaf Discussing Black Hole Spin Watch a video of Robert Naeye and Laura Brenneman discussing spinning black holes and other topics.    read more > By Robert Naeye Lunar Librations for May 2011 There was again not enough room to run our usual lunar libration diagram in the May 2011 issue. Click here to download it in PDF form.    read more > By The Editors of Sky & Telescope

S&T: Leah Tiscione

	Also in This Issue

Galaxy-Hopping the Virgo Cluster Explore the wonderland of galaxies on the border between Vrigo and Coma Berenices.  By Ted Forte The View from Edge-on Hone your observing skills on superthin galaxies.  By Steve Gottlieb Planetary Imaging Primer Planetary observing today involves cameras as much as eyeballs.  By Sean Walker Building My Dream Observatory A veteran telescope maker spent four years building this novel 32-inch reflector and a dome to house it.  By Mario Motta Table of Contents See what else May's issue has to offer.