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how-many-black-holes-have-astronomers-discovered-in-our-milky-way-galaxy-how-do-they-find-a-black-hole https://www.astronomy.com/issues/2009/page/14/ 2009 Issue | Page 14 of 17 | Astronomy.com https://www.astronomy.com/uploads/2021/09/asy-20021018-02697-orig-lg.jpg InStock USD 1.00 1.00 exotic-objects article ASY 2023-05-18 2009-03-23 37190
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2009

The world's best-selling astronomy magazine offers you the most exciting, visually stunning, and timely coverage of the heavens above. Each monthly issue includes expert science reporting, vivid color photography, complete sky coverage, spot-on observing tips, informative telescope reviews, and much more! All this in an easy-to-understand, user-friendly style that's perfect for astronomers at any level.
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Exotic Objects

How many black holes have astronomers discovered in our Milky Way Galaxy? How do they find a black hole?

Science

What is a parsec? Why do scientists use this unit instead of light-years?

Observing

Free preview: Stephen James O’Meara’s Secret Sky, “A volcanic sunset”

Observing

Jupiter’s moons meet

Observing

Glenn Chaple’s Observing Basics: Re-create a Galilean scope

Stars

What is a Wolf-Rayet star?

Science

With temperatures being so low in space, why don’t the gases condense into liquids or freeze as they do here on Earth?

Science

William Sheehan’s Galileo

Exoplanets

Astro Confidential web extra: Extending the conversations

Science

Bob Berman’s Strange Universe: Major mess-ups … maybe

Science

Astro Confidential web extra: Extending the conversations

Planets

Mercury meets the Pleiades

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