Astronomy - USA (2020-03)

AND TRI ARI PER AUR TAU ORI PEG PSC CET FOR CAE COL ERI LEP LY N GEM CMI CMA MON PUP LAC SCL PHE AQR PsA Sun Early evening Uranu ...

WHEN TO VIEW THE PLANETS EVENING SK Y Venus (west) Uranus (west) MORNING SK Y Mercury (east) Mars (southeast) Jupiter (southeast ...

WWW.ASTRONOMY.COM 43 LOCATING ASTEROIDS I Tracking Vesta through Taurus THE BRIGHT LUMINARY Aldebaran, the ruddy eye of the cele ...

44 ASTRONOMY • MARCH 2020 The discovery of two ghostly galaxies created a hullabaloo in the astronomical community. But the jury ...

WWW.ASTRONOMY.COM 45 ome 60 million light- years from Earth — by some researchers’ estimate, anyway — a pair of strange galax- i ...

46 ASTRONOMY • MARCH 2020 Then, based on the Keck data, van Dokkum’s team identified globular clus- ters (large, spherical group ...

Velocit y Dark matter (in red) Globular cluster -30 0 30 Velocity (km/s) Sa m pl e^ si ze Velocity dispersion Velocity with resp ...

Wavelength (angstroms) 8,580 8,600 8,620 8,700 8,720 943 3,262 light-years 10 arc sec 1790 1968 2239 2537 2726 1452 943 1790 196 ...

M a g n it u d e ( V f ilt e r) –1 0 1 2 3 4 5 6 7 8 Temperature (Kelvin) 10,000 8,000 6,000 5,000 4,000 –0.25 0 0.25 0.5 0.75 1 ...

50 ASTRONOMY • MARCH 2020 location, and distance. But, most impor- tantly, DF4 likewise has an apparent dearth of dark matter. U ...

WWW.ASTRONOMY.COM 51 But just before this issue went to press, new research published November 25 in Nature Astronomy reported t ...

Think you know the big spiral M101? Take a deep dive into its myriad details, and you’ll know it like never before. STORY AND IM ...

WWW.ASTRONOMY.COM 53 WHEN YOU HEAR “THE PINWHEEL GALAXY,” YOU probably think of M33 in Triangulum. However, there’s another gala ...

Right triangle asterism Turning-point star Far western spiral arm Broad dark lane Western spiral arm Equilateral triangle Core N ...

NGC 5451 NGC 5449 NGC 5447 NGC 5450 NGC 5455 NGC 5458 NGC 5453 NGC 5461 NGC 5462 NGC 5471 WWW.ASTRONOMY.COM 55 The western spira ...

56 ASTRONOMY • MARCH 2020 1 2 3 5 6 7 8 9 4 Use this map to aim your telescope in the general area of the features shown. NASA’S ...

MOON WWW.ASTRONOMY.COM 57 If you’re just starting out, our natural satellite makes a tempting target in the evening sky. BY MICH ...

58 ASTRONOMY • MARCH 2020 Why this phase? First Quarter falls within the best times for viewing the Moon, when shadows are longe ...

WWW.ASTRONOMY.COM 59 scotopic (daytime) vision, which is of much higher quality than dark-adapted photopic vision. Finally, you ...

60 ASTRONOMY • MARCH 2020 Run a Messier marathon ON YOUR MARK. GET SET ... Amateur astronomers across the world delight in the b ...