2019-06-01+Sky+and+Telescope

“Standard” Candles 18 JUNE 2019 • SKY & TELESCOPE a typical Type Ia. But then, roughly 60 days after it exploded, its spectr ...

skyandtelescope.com • JUNE 2019 19 survey with the Hubble Space Telescope that took a second look at the locations where Type Ia ...

“Standard” Candles 20 JUNE 2019 • SKY & TELESCOPE they quick-moving, but they possess bizarre characteristics that can be pe ...

skyandtelescope.com • JUNE 2019 21 The Weirdos While most Type Ia supernovae look strikingly similar to one another, astronomers ...

COSMIC EXPANSION PUZZLE by Govert Schilling 22 JUNE 2019 • SKY & TELESCOPE ...

NI CO LL E^ R .^ F UL LE R, SA YO A RT LL C skyandtelescope.com • JUNE 2019 23 Astronomers and cosmologists can’t agree on the ...

Cosmic Expansion Puzzle 24 JUNE 2019 • SKY & TELESCOPE I n the 1980s, when people in East and West Berlin still lived in two ...

skyandtelescope.com • JUNE 2019 25 ies — something that (unknown to Hubble at the time) had been predicted to hold in an expandi ...

Cosmic Expansion Puzzle 26 JUNE 2019 • SKY & TELESCOPE mysterious dark energy, the true nature of which is one of the bigges ...

skyandtelescope.com • JUNE 2019 27 the cosmological distance ladder, and at a correspondingly much more precise value for the Hu ...

Cosmic Expansion Puzzle 28 JUNE 2019 • SKY & TELESCOPE Gravitational lensing The light from remote galaxies and quasars can ...

skyandtelescope.com • JUNE 2019 29 BOSS (baryon acoustic oscillations) Dark Energy Survey (cosmic structure + lensing + baryon d ...

OPEN-FACED SPIRALS by Ted Forte 30 JUNE 2019 • SKY & TELESCOPE ElusıveElusıve Hunting GALAXY AND STARS You might not be able ...

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Open-Faced Spirals 32 JUNE 2019 • SKY & TELESCOPE M49 M60 M59 M58 M61 3521 4030 5147 5248 62 φ σ ι υ ν β ο γ η δ ε θ ζ VIRGO ...

skyandtelescope.com • JUNE 2019 33 M3 M53 M64 M85 M91 M88 M98M99 M100 4414 4651 4725 (^47474712) γ α β β LEO +30° +25° 13 h 30 m ...

Open-Faced Spirals 34 JUNE 2019 • SKY & TELESCOPE 5595 5597 _^1 _^2 ` g h LIBRA VIR 15 h 00 m 14 h 30 m –10° –15° –20° Commo ...

skyandtelescope.com • JUNE 2019 35 but may distract the eye from noticing the variations in brightness that trace out its hidden ...

OBSERVING REPORT by Don Ferguson 36 JUNE 2019 • SKY & TELESCOPE The Dawes Limit D istinguishing the binary nature of a star ...

skyandtelescope.com • JUNE 2019 37 Selecting the Targets Some of the closely merged 6th-magnitude stars I observed resembled the ...