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AstronomyAstronomy

Astronomy

July 2019

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 a user-friendly style that's perfect for astronomers at any level.

國家/地區:
United States
語言:
English
出版商:
Kalmbach Publishing Co. - Magazines
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$1,328.41
12 期號

本期

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the magic of apollo 11

Follow the Dave’s Universe blog: www.Astronomy.com/davesuniverse Follow Dave Eicher on Twitter: @deicherstarI remember it like it was yesterday. (Well, OK, not yesterday. It was 50 years ago.) As an excited 7-year-old kid interested in space, I was abuzz to watch the first Moon landing. I remember receiving special parental permission to stay up late.It was July 20, 1969 — an amazing time in history. Richard Nixon loomed over the White House, not yet implicated in the crimes that would bring him down. The first troop withdrawals began in Vietnam, a process that would last another six years. Preparations were commencing for the Woodstock music festival in upstate New York the following month.And the inhabitants of planet Earth were waiting to see Neil Armstrong and Buzz Aldrin step out of the…

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astronomy

Editor David J. EicherArt Director LuAnn Williams BelterEDITORIALSenior Editors Michael E. Bakich, Richard TalcottProduction Editor Elisa R. NeckarAssociate Editors Alison Klesman, Jake ParksCopy Editor Dave LeeARTGraphic Designer Kelly KatlapsIllustrator Roen KellyProduction Specialist Jodi JeranekCONTRIBUTING EDITORSBob Berman, Adam Block, Glenn F. Chaple, Jr., Martin George,Tony Hallas, Phil Harrington, Korey Haynes, Jeff Hester,Liz Kruesi, Ray Jayawardhana, Alister Ling, Steve Nadis,Stephen James O’Meara, Tom Polakis, Martin Ratcliffe, Mike D.Reynolds, Sheldon Reynolds, Erika Rix, Raymond ShubinskiSCIENCE GROUPExecutive Editor Becky LangDesign Director Dan BishopEDITORIAL ADVISORY BOARDBuzz Aldrin, Marcia Bartusiak, Timothy Ferris, Alex Filippenko,Adam Frank, John S. Gallagher lll, Daniel W. E. Green, William K.Hartmann, Paul Hodge, Edward Kolb, Stephen P. Maran,Brian May, S. Alan Stern, James TrefilKALMBACH MEDIAChief Executive Officer Dan HickeySenior Vice President, Finance Christine MetcalfSenior Vice President, Consumer Marketing Nicole McGuireVice President, Content…

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astro letters

We welcome your comments at Astronomy Letters, P. O. Box 1612, Waukesha, WI 53187; or email to letters@astronomy.com. Please include your name, city, state, and country. Letters may be edited for space and clarity.CorrectionOn page 54 of the April issue, we mistakenly used an image of M63 as M94. (The M63 image is correct on page 55.) Here is the image we should have used.Spotting JupiterI’m writing in response to Stephen James O’Meara’s recent “Naked-eye Mars in daylight” column in the February 2019 issue. I live in southwest Utah, and 2012 was a banner year for us. We had an annular eclipse in May, Venus transiting the Sun in June, and the Moon occulting Venus in August. This last event was unfortunately clouded out by rain, but I did get…

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hot bytes

HIDDEN GIANTJapanese astronomers found a 30,000-solarmass black hole hiding in an interstellar gas cloud by watching the gas swirl around the massive object.FAMILIAR TERRAINSlot canyons spotted by Cassini on Saturn’s moon Titan may form like those on Earth — through sporadic heavy flooding, but of methane, not water.COSMIC CONNECTIONResearchers traced meteorites that fell near Sariçiçek, Turkey, to the impact that created a 22 millionyear-old crater on the dwarf planet Ceres.…

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two ghostly galaxies lack dark matter

Last year, astronomers were flabbergasted when they discovered a galaxy almost entirely devoid of dark matter. As the first galaxy ever found lacking the elusive substance — which is thought to account for 85 percent of the universe’s mass — the find left some researchers delightfully intrigued, and others understandably skeptical.“If there’s [only] one object, you always have a little voice in the back of your mind saying, ‘But what if you’re wrong?’” said astronomer Pieter van Dokkum of Yale University, who led last year’s groundbreaking study, in a press release. “Even though we did all the checks we could think of, we were worried that nature had thrown us for a loop and had conspired to make something look really special whereas it was really something more mundane.”Now, in…

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asteroids are tougher than we thought

In many science fiction stories, a bomb is deployed to shatter a life-threatening asteroid headed toward Earth. But a study published March 15 in Icarus shows that breaking up asteroids is actually quite difficult.“Asteroids are stronger than we used to think and require more energy to be completely shattered,” said lead author Charles El Mir, of the Johns Hopkins University’s Department of Mechanical Engineering, in a press release.El Mir’s team simulated the aftermath of a collision between a 15-mile-wide (25 kilometers) asteroid and a 0.75-mile-diameter (1.21 km) basalt impactor traveling at 3 miles (5 km) per second. They used recent advancements in our understanding of how rocks fracture and improved computer code to model the impact in two different stages.First, a material model followed shortterm fragmentation inside the asteroid within…

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