Astronomy October 2021

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.

United States
Kalmbach Publishing Co. - Magazines
6,28 €(IVA Incl.)
40,40 €(IVA Incl.)
12 Edições

nesta edição

2 minutos
whaddya think of ufos?

Follow the Dave’s Universe blog: Follow Dave Eicher on Twitter: @deicherstar In response to the recent uptick in reporting about the subject, and the U.S.government investigations, I jotted down a few thoughts about this subject. As you undoubtedly know, it’s frequently on the minds of observers of the sky. How much life is out there in the cosmos? Are any strange things we’ve seen in the sky evidence of physical visitation by other intelligent life? To scientists, the recent surge in reports and news of governments spending lots of money investigating UFOs are curious. Astrophysicists know that the universe is incredibly large, with at least 100 billion galaxies, and several hundred billion star systems like our Sun’s family in each one. We also know through spectroscopy that chemistry in the universe…

2 minutos
astro let ters

We welcome your comments at Astronomy Letters, P.O. Box 1612, Waukesha, WI 53187; or email Please include your name, city, state, and country. Letters may be edited for space and clarity. Comet observers In their “Comet Search” section of the June Sky This Month column, Martin Ratcliff and Alister Ling noted comet 7P/Pons-Winnecke’s extremely close approach to the Earth in 1927, to within 0.04 AU. At about that time, astronomer Vesto Slipher trained Lowell Observatory’s 24-inch Clark refractor on 7P and espied a “perfectly stellar” nucleus in excellent seeing conditions with the comet nearly overhead. To determine its size, he compared stars of similar brightness near Jupiter with the disks of its Galilean satellites. In Lowell Observatory Bulletin No. 86, he reported, “The disks … appeared large and were estimated at fully…

1 minutos
jupiter’s mammoth moon

NASA’s Juno orbiter snagged new shots of the solar system’s largest moon on June 7, 2021, during the closest flyby of Ganymede in two decades, at a distance of only 645 miles (1,038 kilometers). For comparison, the International Space Station orbits Earth at an average altitude of 250 miles (402 km). Juno captured almost one entire side of Ganymede using the green filter on its visiblelight imager, revealing the moon’s craters and tectonic faults in intricate detail. Scientists hope that these pictures, along with Juno’s other measurements, will shed more light on Ganymede’s composition and atmosphere. — HAILEY ROSE MCLAUGHLIN Mission scientists also compiled Juno’s haul of images into a video showing the craft’s perspective as it flew past Ganymede then swooped around Jupiter, spying the swirling gas bands that encircle the gas giant.…

1 minutos
hot bytes

ORBITAL HOUSEWARMING China’s Shenzhou-12 spacecraft soared into space on June 17 Beijing time, ferrying a crew of three taikonauts to the country’s fledgling Tiangong space station for the first time. The station is expected to serve as an orbiting laboratory for at least the next decade. PERCY’S JOURNEY BEGINS NASA’s Perseverance rover kicked off its first martian science campaign on June 1. After months of systems tests and supporting test flights of the Ingenuity helicopter, Perseverance is setting out to search for signs of ancient microbial life in Jezero Crater. ELUSIVE MERGER After detecting both binary black hole mergers and neutron star mergers, LIGO has finally completed a hat trick by spying a black hole-neutron star merger. Researchers recently announced they had spotted gravitational waves from two such events in January 2020.…

4 minutos
nasa, esa to return to venus

After leaving Venus in relative neglect for almost three decades, the U.S. and Europe are gearing up to mount a set of robotic expeditions that will give us our most comprehensive view yet of Earth’s acidic sister. On June 2, NASA administrator Bill Nelson announced the agency would send two new missions to Earth’s inner neighbor by 2030. One of them, DAVINCI+, is a probe that will fall through Venus’ atmosphere, sampling its caustic clouds and snapping closeups of its terrain. The other, VERITAS, will study the planet from orbit with state-of-the-art radar and imagers. Eight days after NASA’s statement, the European Space Agency (ESA) announced it had greenlit EnVision, another orbiter that will arrive at Venus in the early 2030s to study both its surface and its oppressive atmosphere. The news thrilled…

1 minutos
quick takes

FROM ERRORS, DATA Cosmic rays — radiation in the form of atomic nuclei moving at near light speed — regularly zip through satellite computers, causing errors. By combing through 15 years of error logs from ESA’s Rosetta and Mars Express probes, researchers found that increased solar activity results in fewer cosmic rays penetrating the solar system. WATER, WATER EVERYWHERE New calculations suggest liquid water can exist on the surfaces of moons of free-floating planets — worlds with no host star. Under certain conditions, cosmic rays and tidal forces can melt water on these moons in quantities large enough to support life. DARK MATTER’S A DRAG The rotation of the Milky Way’s central bar has slowed by more than 24 percent since it formed, according to an analysis of the ages of stars within the bar.…