EXPLORARBIBLIOTECA
Ciência
Astronomy

Astronomy April 2016

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.

País:
United States
Língua:
English
Editora:
Kalmbach Publishing Co. - Magazines
Periodicidade:
Monthly
Ler Mais
ASSINATURA
US$ 42,99
12 Edições

nesta edição

2 minutos
whither the astronomy hobby?

For years, astronomy enthusiasts have noticed the graying of our hobby. As with other serious fields, amateur astronomy meetings and star parties over the past decade have trended toward an older crowd, with largely the same faces showing up at the same events. Where are the young people? This question echoes throughout the chambers of astronomy clubs and star party organizers across the United States and the world. On p. 61, two enthusiastic amateur astronomers — Kevin Ritschel and Maria Grusauskas, one veteran and one youngster — ask, “Where is amateur astronomy going?” Their commentary will no doubt provide you with some intriguing thoughts. The amateur astronomy hobby hasn’t necessarily gone anywhere, but like other areas of interest, it’s in the midst of dramatic, whirlwind change. The print circulation of Astronomy has held…

1 minutos
musings on the nearest star

If you or I had a spare 75,000 years and a few trillion dollars set aside, we could try journeying to the closest star beyond the Sun, Alpha Centauri. Some 4.3 lightyears away, this triple star system is more representative of stars in the galaxy than our loner Sun. Alpha Centauri consists of a bright double star, Alpha A and Alpha B, and a distantly orbiting red dwarf called Proxima Centauri, which is a shade closer to us at 4.2 light-years. Alpha Centauri is one of the most brilliant stars in the southern sky, shining at magnitude 0. It is prominently visible to the naked eye as the luminary of Centaurus, nestled near the bright constellation Crux the Southern Cross. Of the double star components, Alpha Cen A is a sunlike star…

4 minutos
april fool’s!

Some areas of science advance in increments. We see slow evolutionary improvements in aeronautical engineering and medical discoveries. But astronomy is different. Here, the universe often leaps out and goes boo! So let’s use April Fool’s Day as our excuse to review the top 20 “pranks” the cosmos has sprung on us. Start with Galileo. Since no one had pointed a telescope at the sky before, he was bound to get surprises. Nobody had foreseen lunar craters or moons going around other planets like Jupiter, as he observed. But when he looked at Saturn, he entered the Twilight Zone. On Earth, there’s no example of a ball surrounded by unattached rings. This was beyond human experience. No wonder it took two centuries for anyone to deduce that they’re neither solid nor…

2 minutos
letters

FROM OUR INBOX Kudos I’ve been reading Astronomy magazine for years, and the December issue is by far the best. What a terrific job of putting the universe in perspective — no easy task. It is an absolutely stunning combination of writing, photos, and graphics. Congratulations David Eicher and every single member of your staff. — David Davidson, Atlanta Beautiful diagrams You really outdid yourself this time. The December issue was outstanding! The graphics that accompanied the clearly written text were both beautiful and informative. The diagrams of the Local Group on p. 47 and the Local Supercluster on p. 53 are amazing and put everything into perspective. I keep going back to them trying to visualize the immensity of space they portray and then realize that even the supercluster graphic would turn into a…

2 minutos
supernova prediction leads to image

NEW MOON ROCKS. China’s Yutu rover has found a new kind of lunar rock. The first spacecraft to explore the Moon since Apollo found titanium levels unlike anything astronauts brought back. The finding could ultimately help explain the Moon’s formation. On December 11, astronomers used the Hubble Space Telescope to image for the first time a supernova at the place and time they predicted it would appear. The project began after the Grism Lens Amplified Survey from Space and Hubble’s Frontier Fields program captured the distant galaxy cluster MACS J1149+2223, creating multiple images of a supernova around a large elliptical galaxy. Astronomers refer to this process as gravitational lensing. The cluster lies some 5 billion light-years from Earth, and the supernova is roughly twice as far away. “It really threw me for a…

1 minutos
star sizes

Red giants range from 20 to 100 times the Sun’s size. On this scale, the smallest is a circle whose diameter is 26.6 inches; the largest spans 133.33 inches. Red supergiant (not shown): 900 to 1,200 The smallest and largest red supergiant stars would form circles with edges 600 and 800 inches from the Sun’s center, respectively. FAST FACT Although Arcturus (Alpha [α] Boötis) is often called a red giant, it is, in fact, orange.…