2019-08-01_Sky_and_Telescope

Life As We Don’t Know It 38 AUGUST 2019 • SKY & TELESCOPE Io Europa Ganymede Mercury Venus Earth Orbits enlar ged^2 5 x Call ...

skyandtelescope.com • AUGUST 2019 39 reality is that the planet has long been desiccated. However, if a planet begins with enoug ...

Life As We Don’t Know It 40 AUGUST 2019 • SKY & TELESCOPE But on a planet orbiting a red dwarf, ice and snow will instead ab ...

OBSERVING August 2019 skyandtelescope.com • AUGUST 2019 41 DUSK: The thin waxing lunar crescent is in Virgo the next two evening ...

USING THE NORTHERN HEMISPHERE MAP Go out within an hour of a time listed to the right. Turn the map around so the yellow label f ...

6709 ε ζ θ AQUILA HERCULES OPHIUCHUS SERPENS CAUDA 5 ° bi noc ular^ view HD 172010 HD 172827 HD 172744 HD 171975 WHEN TO USE THE ...

44 AUGUST 2019 • SKY & TELESCOPE Mercury Saturn Uranus Neptune 10 " Aug 1 11 21 31 116 31 11631 16 16 Venus Jupiter Mars AUG ...

MI KE LL JO HN SO N^ / CC BY SA -^3. 0 I n last month’s column, we began a survey of colors visible in the summer night skies. ...

46 AUGUST 2019 • SKY & TELESCOPE AUGUST 2019 OBSERVING Sun, Moon & Planets by Fred Schaaf quThese scenes are drawn for n ...

skyandtelescope.com • AUGUST 2019 47 brightness and size in August. The golden world’s magnitude diminishes from +0.2 to +0.3 an ...

AUGUST 2019 OBSERVING Celestial Calendar by S. N. Johnson-Roehr Three for One Three asteroids, traveling conveniently close to o ...

NA SA /^ J PL- CA LT EC H^ / AR IZO NA ST AT E^ U NIV ER SIT Y^ / SP AC E^ S YS TE MS LO RA L^ / PE TE R^ R UB IN for observers ...

AUGUST 2019 OBSERVING Celestial Calendar Moon Blocks Star THE WANING MOON HIDES a 3rd-magnitude star in Taurus on the morning of ...

The wavy lines represent Jupiter’s four big satellites. The central vertical band is Jupiter itself. Each gray or black horizont ...

52 AUGUST 2019 • SKY & TEL- Unruly Crater Rays These long, bright streaks crisscross the lunar surface yet defy easy explana ...

skyandtelescope.com • AUGUST 2019 5353 NA SA /^ L UN AR RE CO NN AIS SA NC E^ O RB ITE R^ ( 3 ) skyandtelescope.com • AUGUST 201 ...

NA SA /^ E SA /^ H UB BL E^ H ER ITA GE TE AM AUGUST 2019 OBSERVING Deep-Sky Wonders by Sue French The Glorious Eagle Many lesse ...

SK ET CH :^ S UE FR EN CH ;^ E AG LE NE BU LA :^ T. A. RE CT OR (N RA O^ / AU I^ /^ NS F^ A ND NO AO /^ AU RA /^ N SF )^ /^ B.^ ...

56 AUGUST 2019 • SKY & TELESCOPE The Eagle and Its Nestlings Object Type Mag(v) Size/Sep RA Dec. Messier 16 Cluster / nebula ...

skyandtelescope.com • AUGUST 2019 57 JULY 26–AUGUST 4, 2019 “A magnificent tour of a wonderful history.” —John C. Mather, Nobel ...