Astronomy - USA (2019-09)

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4 ASTRONOMY • SEPTEMBER 2019 22 SPECIAL ISSUE Are we alone in the universe? Mars, Pluto, and an array of icy moons offer possibl ...

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WWW.ASTRONOMY.COM 9 STUNNING SPIRAL A galaxy spreads its arms wide. Like most galaxies, NGC 2903 hides a dark secret: a supermas ...

10 ASTRONOMY • SEPTEMBER 2019 QUANTUM GRAVITY Scientists know the universe is expanding. But there’s a conun- drum: Studies of t ...

a galaxy’s distance has been established with Cepheids, astronomers can use the same galaxy to calibrate the next rung on the la ...

12 ASTRONOMY • SEPTEMBER 2019 QUANTUM GRAVITY Geological evidence sug- gests water once freely flowed across Mars’ surface. Now, ...

Europa (Jupiter) Diameter: 1,940 miles (3,100 km) Enceladus (Saturn) Diameter: 313 miles (504 km) To scale Titan (Saturn) Diamet ...

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