Holly Purdy

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Brazilian Ricardo Stuckert accidentally stumbled on to the tribe after his helicopter was diverted<p>A photographer has captured images of an uncontacted Amazonian tribe after his helicopter flight took a detour to avoid a rainstorm and happened to fly over their longhouse.<p>Related: Sighting of …

Brazil

Asteroid swings very near Earth: Are you up for a midnight viewing?

An asteroid five football fields wide will make a near-Earth flyby on Monday, and you may be able to see it at the witching hour with a pair of strong binoculars.<p>Late Monday -- particularly at midnight -- will be prime time for trying to catch a glimpse of asteroid 2004 BL86, said the Jet …

Retrograde Mars

<b>Retrograde Mars</b><br>Credit & Copyright: Tunç Tezel (TWAN)<br>Moons and Planets Wall Calendar: http://asterisk.apod.com/viewtopic.php?f=28&t=33730&p=230131<br>http://apod.nasa.gov/apod/ap141028.html<p>Why would Mars appear to move backwards? Most of the time, the apparent motion of Mars in Earth's sky is in one direction, slow but steady in front of the far distant stars. About every two years, however, the Earth passes Mars as they orbit around the Sun. During the most recent such pass starting late last year, …

Galaxies in Pegasus

<b>Galaxies in Pegasus</b><br>Image Credit & Copyright: Alessandro Benedetti and Daniele Ceniti (AeW Observatory)<br>http://apod.nasa.gov/apod/ap141023.html<p>This wide, sharp telescopic view reveals galaxies scattered beyond the stars and faint dust nebulae of the Milky Way at the northern boundary of the high-flying constellation Pegasus. Prominent at the upper right is NGC 7331. A mere 50 million light-years away, the large spiral is one of the brighter galaxies not included in Charles Messier's famous 18th …

Comet McNaught Over New Zealand

<b>Comet McNaught Over New Zealand</b><br>Image Credit & Copyright: Minoru Yoneto<br>http://apod.nasa.gov/apod/ap141019.html<p>Comet McNaught was perhaps the most photogenic comet of modern times -- from Earth. After making quite a show in the northern hemisphere in early January of 2007, the comet moved south and developed a long and unusual dust tail that dazzled southern hemisphere observers. In late January 2007, Comet McNaught was captured between Mount Remarkable and Cecil Peak in this spectacular image …

How Politics Breaks Our Brains, and How We Can Put Them Back Together

I’m ly­ing in the met­al coffin of an MRI ma­chine, listen­ing to what sounds like jack­ham­mers and smelling my own breath go stale. My head is …

NGC 206 and the Star Clouds of Andromeda

<b>NGC 206 and the Star Clouds of Andromeda</b><br>Image Credit and Copyright: Subaru Telescope (NAOJ), <br>Hubble Space Telescope, Local Group Galaxy Survey (Phil Massey, PI), Mayall 4-meter , Robert Gendler<br>http://apod.nasa.gov/apod/ap140925.html<p>The large stellar association cataloged as NGC 206 is nestled within the dusty arms of the neighboring Andromeda galaxy. Also known as M31, the spiral galaxy is a mere 2.5 million light-years away. NGC 206 is near top center in this gorgeous close-up of the …

Two Black Holes Dancing in 3C 75

<b>Two Black Holes Dancing in 3C 75</b><br>Image Credit: X-Ray: +NASA/CXC/D. Hudson, T.Reiprich et al. (AIfA); Radio: NRAO/VLA/ NRL<br>http://apod.nasa.gov/apod/ap140928.html<br>Galaxies Wall Calendar: http://asterisk.apod.com/viewtopic.php?f=28&t=33730&p=230131<p>What's happening at the center of active galaxy 3C 75? The two bright sources at the center of this composite x-ray (blue)/ radio (pink) image are co-orbiting supermassive black holes powering the giant radio source 3C 75. Surrounded by multimillion degree …

The Bubble Nebula

Blown by the wind from a massive star, this interstellar apparition has a surprisingly familiar shape. Cataloged as NGC 7635, it is also known simply as The Bubble Nebula. Although it looks delicate, the 10 light-year diameter bubble offers evidence of violent processes at work. Below and left of the Bubble's center is a hot, O star, several hundred thousand times more luminous and around 45 times more massive than the Sun. A fierce stellar wind and intense radiation from that star has blasted …

Space Station Detector Finds Unexplained Positron Excess

<b>Space Station Detector Finds Unexplained Positron Excess</b><br>Image Credit & License: +Ron Garan, STS-134 Crew, Expedition 28 Crew, +NASA<br>http://apod.nasa.gov/apod/ap141006.html<p>Where did all these high energy positrons come from? The Alpha Magnetic Spectrometer (AMS-02) onboard the International Space Station (ISS) has been meticulously recording how often it is struck by both high energy electrons and positrons since 2011. After accumulating years of data, it has now become clear that there are …

From the Temple of the Sun to the Temple of the Moon

<b>From the Temple of the Sun to the Temple of the Moon</b><br>Image Credit & Copyright: Dave Lane<br>http://apod.nasa.gov/apod/ap141007.html<i><br>New:</i> Follow APOD on Ello at https://ello.co/apod<p>What connects the Sun to the Moon? Many answers have been given throughout history, but in the case of today's featured image, it appears to be the plane of our Milky Way Galaxy. The 16-image panorama was taken in Capitol Reef National Park, Utah, USA where two sandstone monoliths -- the Temple of the Moon on the left and …

NGC 6823: Cloud Sculpting Star Cluster

<b>NGC 6823: Cloud Sculpting Star Cluster</b><br>Image Credit & Copyright: Donald P. Waid (Waid Observatory)<br>http://apod.nasa.gov/apod/ap141008.html<br>Nebulas and Star Clusters Wall Calendar: http://asterisk.apod.com/viewtopic.php?f=28&t=33730&p=230131<p>Star cluster NGC 6823 is slowly turning gas clouds into stars. The center of the open cluster, visible on the upper right, formed only about two million years ago and is dominated in brightness by a host of bright young blue stars. Some outer parts of the …

The Hummingbird Effect: How Galileo Invented Timekeeping and Forever Changed Modern Life

While we appreciate it in the abstract, few of us pause to grasp the miracles of modern life, from artificial light to air conditioning, as <b>Steven Johnson</b> puts it in the excellent <b>How We Got to Now: Six Innovations That Made the Modern World</b> (<i>public library</i>), “how amazing it is that we drink water …

This new hyperrealistic graphics engine will change the world ... if it's real

Or it could just end up benefiting the US military industrial complex.

Earth at Equinox

<b>Earth at Equinox</b><br>Video Credit: Roscosmos (+Телестудия Роскосмоса) / NTSOMZ / zelenyikot.livejournal.com <br>Courtesy: Igor Tirsky, Vitaliy Egorov<br>http://apod.nasa.gov/apod/ap140922.html<p>Earth is at equinox. Over the next 24 hours, day and night have nearly equal duration all over planet Earth. Technically, equinox transpires at 2:29 am Universal Time tomorrow, but this occurs today in North and South America. This September equinox signal that winter is approaching in the northern hemisphere, and …

Aurora and Volcanic Light Pillar

<b>Aurora and Volcanic Light Pillar</b><br>Image Credit & Copyright: Stéphane Vetter (Nuits sacrées)<br>http://apod.nasa.gov/apod/ap140923.html<br>Land and Skyscapes Wall Calendar: http://asterisk.apod.com/viewtopic.php?f=28&t=33730&p=230131<p>That's no sunset. And that thin red line just above it -- that's not a sun pillar. The red glow on the horizon originates from a volcanic eruption, and the red line is the eruption's reflection from fluttering atmospheric ice crystals. This unusual volcanic light pillar was …