Page 70 - Astronomy - October 2017 USA

READER

GALLERY

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1. COLORFUL SPIRALS
NGC 4151 (left) is a Seyfert galaxy
45 million light-years away. It hosts
one of the brightest active galactic
nuclei known at X-ray wavelengths.
NGC 4145 is a million light-years closer
and is considered “anemic” because
not much star formation is occurring in
it. • Mark Hanson

2. CHROMATIC SPLENDOR
The region around the star Rho (ρ)
Ophiuchi is one of the most colorful
in the sky. The interstellar clouds of
gas here contain both red emission
and blue reflection nebulosity. And
then there’s the dust, which pep-
pers the region with dark nebulae.
• Miguel Claro

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70 ASTRONOMY • OCTOBER 2017