Astronomy
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22 ASTRONOMY • DECEMBER 2015 IT’S ABSOLUTELY AMAZING to know that shortly after the Big Bang, the universe was a relatively smal ...
WWW.ASTRONOMY.COM 23 critical to comprehending how the universe works. And exploring the cosmic distance scale also unveils a sl ...
Great Attractor 218 million light-years Perseus Cluster 248 million light-years Coma Cluster 319 million light-years million lig ...
Hercules Cluster 501 million light-years Shapley Supercluster 586 million light-years 500 600 700 800 900 WWW.ASTRONOMY.COM 25 c ...
billion light-years 11.25 Boötes Supercluster 936 million light-years 26 ASTRONOMY • DECEMBER 2015 and composition. Yet with an ...
1.5 1.75 Sculptor Supercluster 1.37 billion light-years WWW.ASTRONOMY.COM 27 air. Once the atmosphere was thin enough, Mars cool ...
billion light-years 22.25 3C 273 (quasar) 1.99 billion light-years Abell 1689 (galaxy cluster) 2.27 billion light-years 28 ASTRO ...
2.5 Abell 1687 (galaxy cluster) 2.40 billion light-years WWW.ASTRONOMY.COM 29 “ice giants.” Both planets are about four times th ...
billion light-years 2.75 3 SOONER OR LATER ON ANY CLEAR, DARK NIGHT, AN ETHE- REAL BAND CALLED THE MILKY WAY ARCHES ACROSS THE S ...
3.25 3.5 Pandora’s Cluster 3.52 billion light-years WWW.ASTRONOMY.COM 31 Scientists think our gal- axy has four major spiral arm ...
billion light-years 3.75 4 3C 48 (quasar) 4.05 billion light-years 32 ASTRONOMY • DECEMBER 2015 dust-obscured regions of the dis ...
4.25 4.5 WWW.ASTRONOMY.COM 33 complete, the Sun’s position oscillates above and below the galactic plane. Other stars in our vic ...
billion light-years 4.75 5 34 ASTRONOMY • DECEMBER 2015 binary systems located about 7,500 light- years away and shining with 6. ...
5.25 WWW.ASTRONOMY.COM 35 but recent studies show a wide range of stellar ages, from 3 to 12 billion years, closer to the midpla ...
December 1, 5 A.M. Looking southeast Arcturus Denebola Jupiter Mars Venus Spica Alphard 10° CORVUS BOÖTES LEO VIRGO HYDRA A plan ...
ORION URSA MAJOR AURIGA GEMINI TAURUS LEO Procyon Rigel Betelgeuse Aldebaran Capella Radiant Castor Pollux December 14, 1 A.M. L ...
_ _ _ _ _ ` ` ` ` e ` i a a _ ¡ _ _ _ _ _ ` ` f f f ` ` a j a _ a ¡ ¡ ¡ ¡ _ _ c c c c c d o a a a a _ ` ` ` ` l ` ` c b b b b b ...
12345 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 SUN. MON. TUES. WED. THURS. FRI. SAT. ` ` ` b ¡ ...
PATHOF THE PLANETS The planets in the sky These illustrations show the size, phase, and orientation of each planet and the two b ...
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