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why-werent-astronomers-sure-that-supermassive-black-holes-could-merge https://www.astronomy.com/issues/2024/september-2024/ September 2024 Issue | Astronomy.com https://www.astronomy.com/uploads/2024/08/Low-Res_image-000-_000150.webp InStock USD 1.00 1.00 exotic-objects article ASY 2024-09-23 2024-09-23 152109
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Astronomy September 2024 cover

September 2024

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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simulation of merging supermassive black holes
Exotic Objects

Why weren’t astronomers sure that supermassive black holes could merge?

Albireo (Beta [β] Cygni) is a classic example of a double star with contrasting colors.
Observing, Stars

What gives stars their colors?

The five members of the animal kingdom we observed during the April 2024 solar eclipse from Bee Cave, Texas, are shown clockwise from top left: northern cardinal, American robin, mosquito, cloudless sulphur butterfly, and a Mexican free-tailed bat. Images showing totality and the mosquito were taken on eclipse day.
2024 Solar Eclipse

Studying nature’s eclipse reactions

Lunar eclipse geometry
Science, The Moon

Why can we still see the Moon’s disk during a total lunar eclipse?

Autoguiding can take your astrophotography to the next level, as exemplified in this 6.5-hour exposure of the Trifid Nebula (M20). Here, the nebulosity stands out in all its glory among perfect, round stars. The author took this shot with a 10-inch f/3.8 Newtonian and Atik 16200 CCD.
Telescopes and Equipment

How to use an autoguider for the best astrophotos

Exotic Objects

How can a black hole pull light into itself if a photon is massless?

The Southern Ring Nebula (NGC 3132) was one of James Webb Space Telescope’s first targets after launching summer of 2022. Using the available data and processing software, anyone can create their own unique image.
Astrophotography

How to process JWST images like a pro

The majestic crown of the active Sun reveals itself with countless streamers, as imaged through high, thin clouds from Torreón, Mexico.
2024 Solar Eclipse, The Sun

A look back: The Great North American Eclipse delivers

NGC 253 in Sculptor
Astronomy for beginners, Observing

What do NGC numbers mean?

Telescopes and Equipment

Fall into new astronomy products this month

The author took this digital color image of the Andromeda Galaxy and its two main satellites with a 5-inch apochromatic refractor, Canon R mirrorless camera, and IDAS LPS 4 filter. The total exposure time was 18 minutes at ISO 4000.
Galaxies

Get to know the Andromeda Galaxy

Saturn at Opposition at Waterton Lakes
Observing

September 2024: What’s in the sky this month?

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