EXPLORARBIBLIOTECA
Ciência
Astronomy

Astronomy November 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

3 minutos
cosmic oddities

One of the more entertaining astronomy books from the 1980s was a work by Martin Harwit called Cosmic Discovery: The Search, Scope, and Heritage of Astronomy. This fascinating study by a Czech-American astronomer was one of the first to try to quantify something about 20th-century astronomical discoveries. Examining the methods by which astronomers find and identify different phenomena, and the kinds of creatures they have found in our galaxy and beyond, was a fascinating approach. Most impressively, after describing unusual types of astronomical objects, Harwit argued that perhaps as many as 123 types of astronomical phenomena exist within the universe, and that, in 1981, astronomers knew of only about one-third that number. Our knowledge has changed a good deal since 1981. We knew nothing of dark energy at the time, or dwarf…

2 minutos
will we ever decipher dark matter?

Fritz Zwicky suggested it in the 1930s. Years later, in the 1970s, Vera Rubin and her group discovered concrete evidence for it. And decades later, the Planck satellite determined that 26 percent of the universe is composed of it. And yet we still really have no idea what dark matter may be. For a time, cosmologists thought it may consist of large items — free-floating black holes, runaway planets, brown dwarfs that were hard to see over long distances, or socalled MACHOS, massive compact halo objects. But the evidence seems to point away from any of these large critters on a scale that we could easily understand, and toward subatomic particles. In the 1970s, physicists proposed an elementary particle called the axion that has a very small mass and — if it…

4 minutos
the super-ultra hypermoon

Of all the things happening in the universe this year, the November 14 “Super Moon” will probably get the most media attention. This extraordinarily close lunar approach is not hype — well, not all hype. “Super Moon” never used to be a term uttered by astrophysicists, but now, almost everyone is using it. The public loves this concept, and, after all, it’s a celestial event that physically affects us. We can’t say that about a Jupiter opposition or a supernova in the Whirlpool Galaxy. In my area, people taking the woodsy trail along the Hudson River within an hour of high tide on November 15 will have to wade through knee-deep water. (Tides are highest one day after a Super Moon). It’s a tangible connection between our world and the cosmos. The…

1 minutos
from our inbox

Well explained I wish to take this opportunity to thank John Kormendy for his article “Why are there so many black holes?” in the August 2016 issue. His explanation was clear and concise and helped me understand, at least in a basic manner, the physics involved in our complicated universe. It is rare to have a comprehensive picture and explanation in such terms as to be understood by the general public. Thank you for understanding the need for clarity and simplicity in this work. 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.…

1 minutos
new map plots 1.2 million galaxies

In the quest for dark energy, astronomers have created an unprecedented 3-D map of 1.2 million galaxies in a volume of about 650 cubic billion light-years. Hundreds of astronomers from the Sloan Digital Sky Survey III (SDSS-III) and the Max Planck institutes for extraterrestrial physics (MPE) and for astrophysics (MPA) contributed. The astronomers found that the map agrees with the current cosmological model (the Lambda Cold Dark Matter model), and confirms that dark energy is a cosmological constant. The project was designed to monitor the cosmological constant, sometimes called Lambda. The term was coined by Albert Einstein to describe the repellent effect in the universe. By mapping the galaxies, researchers could witness their interactions. The map reveals that galaxies tend to move to areas with more matter, staying true to the laws…

1 minutos
mercury used to be much larger

BIGGER ON THE INSIDE. Something is weird at Mercury. In a conference paper presented in June, researchers showed that the materials on the surface of the planet (as observed by MESSENGER) formed under deeper pressure than would happen at the surface of the planet. And its solid inner core is much thicker than that on Earth. So what happened? Some researchers think that Mercury was once a much larger planet. Many solar systems we’ve observed have planets much closer to their stars than Mercury. Kathryn Volk, a postdoc at the University of British Columbia, believes some of these planets may have destabilized in our own solar system and smashed into each other. Mercury was the sole survivor, though much of its original crust and mantle were destroyed. It returned to a…