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when-did-we-realize-that-the-earth-orbits-the-sun https://www.astronomy.com/issues/2017/ 2017 Issue | Astronomy.com https://www.astronomy.com/uploads/2021/09/8980150253_4ac1b9cc30_b.jpg InStock USD 1.00 1.00 solar-system the-sun article ASY 2024-05-20 2024-04-12 43068
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2017

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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Solar System, The Sun

When did we realize that Earth orbits the Sun?

Exotic Objects

Pulsars at 50: still going strong

Robotic Spaceflight, Science

How Gaia will map the galaxy one star at a time

Science

5 Questions with David J. Eicher: Episode 14 – Robert Williams

Science

5 Questions with David J. Eicher: Episode 13 – Jay Gallagher

Science

Pointing poleward

Deep-Sky Objects, Observing

The Triangulum Galaxy

Observing, Telescopes and Equipment

Why I don’t endorse equipment

Science

Intelligent design?

Stars

Why do neutron stars have magnetism? Is the magnetism of a neutron star the same as a Child’s toy magnet? If a neutron star emits photons, where would they come from, and would they not experience the Zeeman effect? Why are neutron stars called stars?

Exotic Objects, Stars

How many solar masses must a star be to end up a black hole (before normal mass loss during its life)?

Cosmology, Galaxies

Do blueshifted galaxies contradict the expansion of the universe?

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