Astronomy - 06.2019

WWW.ASTRONOMY.COM 21 Something appears amiss in cosmology. A tension has arisen from attempts to measure the universe’s current ...

22 ASTRONOMY • JUNE 2019 They monitored Cepheid variable stars in far-f lung galaxies. The luminosities of these supergiant star ...

WWW.ASTRONOMY.COM 23 enough for Cepheid monitoring but also have hosted type Ia supernovae in recent years. His team has analyze ...

60 65 70 75 80 CMB LOCAL UNIVERSE Planck (2018) SH0ES (2018) Carnegie (2018, H band) Carnegie (2018, B band) H0LiCOW (2018) Hubb ...

WWW.ASTRONOMY.COM 25 cosmologists plug these numbers into Einstein’s equations from the general the- ory of relativity, they pre ...

26 ASTRONOMY • JUNE 2019 know what is causing cosmic expansion to accelerate. It might be Einstein’s cos- mological constant; it ...

WWW.ASTRONOMY.COM 27 results. Fortunately, unlike the Hubble Wars of yesteryear, the modern discrep- ancy has not devolved into ...

28 ASTRONOMY • JUNE 2019 The historic encounter gave us our first close-up look at a Kuiper Belt object, the most distant body w ...

WWW.ASTRONOMY.COM 29 ...

30 ASTRONOMY • JUNE 2019 could not have been set up any better. And its master architect, planetary scientist Alan Stern, had th ...

WWW.ASTRONOMY.COM 31 Ultima Thule. For now, my mission was to soak in the historic moment and to highlight the first results, th ...

32 ASTRONOMY • JUNE 2019 demoted to dwarf planet status in 2006, but the plans had long been underway to visit this world, viewe ...

2018 21 miles (33 km) 2019 21 miles (33 km) Ultima Thule 3 miles Brighter regions Remarkable “neck” Darker regions 0 0.02 0.08 0 ...

0° -10 0 10 Haumea Makemake Eris Pluto^20 30 40 50 5° 10° 15° 20° 25° 30° 35° Orbital tilt Redness Cold classical Other KBOs Ult ...

WWW.ASTRONOMY.COM 35 the final days and hours of the encoun- ter. Near year’s end, the New Horizons team believed Ultima Thule t ...

Antares Jupiter SAGITTARIUS SCORPIUS LUPUS LIBRA OPHIUCHUS June 10, 11 P.M. Looking south-southeast Saturn 10° Jupiter at its fi ...

Pearly noctilucent clouds WWW.ASTRONOMY.COM 37 METEORWATCH Despite the lack of major meteor showers in June, sporadic meteors co ...

_ ` ` a _ ` _ a b ¡ d _ ` c a _ b ¡ d ` ` _ _ ` a m _ / _ ¡ c b a d d + f a _ ` c b ¡ _ ` a a _ c ` a i _ f b d _ ` i d b _ ` ` ...

1 2345678 9 1 01112131415 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 SUN. MON. TUES. WED. THURS. FRI. SAT. _ ` b ` a b c ¡ _ _ ...

PATHOF THE PLANETS The planets in the sky These illustrations show the size, phase, and orientation of each planet and the two b ...