2019-08-01_Sky_and_Telescope

X-ray Explorers 18 AUGUST 2019 • SKY & TELESCOPE became clear that what appeared to be a diffuse X-ray back- ground was actu ...

skyandtelescope.com • AUGUST 2019 19 ment, a calorimeter designed to measure X-ray spectra at extremely high resolution, was mov ...

X-ray Explorers 20 AUGUST 2019 • SKY & TELESCOPE the aspect operations scientist, who looked up the source and discovered th ...

skyandtelescope.com • AUGUST 2019 21 caused the spacecraft to spin out of control and, within hours, break apart (S&T: July ...

WE’LL HAVE TO THINK by Brian Ventrudo 22 AUGUST 2019 • SKY & TELESCOPE D uring his investigations of the structure of the at ...

AK IRA FU JII skyandtelescope.com • AUGUST 2019 23 Clusters and Supergiants in Scorpius Turn a small scope towards the widest pa ...

24 AUGUST 2019 • SKY & TELESCOPE Surfi ng the Star Fields of Sagittarius While Scorpius is a delight, Sagittarius is even be ...

skyandtelescope.com • AUGUST 2019 25 Until the late 18th century, most astronomical discoveries were made with small telescopes, ...

We’ll Have to Think 26 AUGUST 2019 • SKY & TELESCOPE Continue north-northeast to fi nd yet another gap in the dark interstel ...

skyandtelescope.com • AUGUST 2019 27 To get the best possible view with a small scope, you need to maximize the amount of light ...

NG C^6 88 8 :^ BR IAN D. M OO RE /^ J EF F^ H ES TE R^ / PA UL SC OW EN /^ RE GIN AL D^ D UF OU R^ / NA SA /^ E SA ;^ S H^2 -^30 ...

skyandtelescope.com • AUGUST 2019 29 ETHEREAL BUBBLEMore than 5,000 light-years away in Canis Major, Sh 2-308 spans some 50 to 6 ...

Wolf-Rayet Nebulae 30 AUGUST 2019 • SKY & TELESCOPE ARCS AND FILAMENTS Lying in the Cygnus OB 3 association, WR 134 is respo ...

skyandtelescope.com • AUGUST 2019 31 The nitrogen-rich star’s powerful stellar wind, blowing at a blistering speed of 2,000 km/s ...

32 AUGUST 2019 • SKY & TELESCOPE Wind-Blown Bubbles Object WR No. HD Spectral Type Mag(v) Size RA Dec. NGC 6888 136 192163 W ...

skyandtelescope.com • AUGUST 2019 33 A few years later I used an 18-inch refl ector in rural Australia and found NGC 3199 rich i ...

LE AH TI SC ION E^ / S& T LIFE AS WE DON’T KNOW IT by Igor Palubski and Aomawa Shields 34 AUGUST 2019 • SKY & TELESCOPE ...

skyandtelescope.com • AUGUST 2019 35 bility Recipe ...

Life As We Don’t Know It 36 AUGUST 2019 • SKY & TELESCOPE tances from a star where conditions on an Earth-like planet would ...

skyandtelescope.com • AUGUST 2019 37 ate a thick blanket of clouds on its dayside. Those clouds would refl ect the star’s light ...