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    • Camily Lobo

      Astrofoto: Júpiter conhece o halo lunar

    • Mona Evans

      Jupiter Meets Moon Halo. Moon-Jupiter conjunction on January 14, 2014 plus a beautiful lunar halo, as seen from Ankara, Turkey. (Credit and copyright: M. Rasid Tugral)

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    Milky Way over Crater Lake National Park. A June (2015) visitor took this amazing photo. Of the experience, she says, "I must've gotten over a dozen mosquito bites and hardly any sleep, but it's nights like this I'll never forget." (Photo courtesy of Tiffany Nguyen)

    Venus And Jupiter 2015.06.30. A beautiful close encounter in the sunset sky only a third of a degree apart. Photographer Marek Nikodem with a friend are enjoying the view from Bydgoszcz, Poland.

    Cloud iridescence, Yosemite National Park, CA. A lucky visitor was able to spot and capture this rare occurrence over Glacier Point. The optical phenomenon is caused when sunlight diffracts off tiny ice crystals or water droplets and creates a rainbow effect. Iridescent clouds typically occur in late afternoons in hot and humid weather.

    Venus, Jupiter, and the crescent Moon in the western sky after sunset on June 19, 2015. The two bright planets will come within 0.3 degrees of each other on June 30, 2015. (Credit: Brian Ventrudo)

    Moon, Venus, Jupiter on June 18, 2015 by Daniel McVey in Silverthorne, Colorado.

    Mammatus clouds in Novosibirsk, Siberia on June 4, 2015. These strange clouds that look like little pouches are normally associated with warm tropical weather and warn that there are severe thunderstorms nearby. Their strange puffy patterns are very other-wordly and indeed some people thought that this world world was ending. (Image credit: Elena Shurshilkina_

    Cosmic ray air shower. The primary cosmic ray is a high-energy particle that collides with a molecule in the upper atmosphere. The collision produces subatomic particles which further collide with air molecules, producing a cascade of secondary rays. (Image credit: Alberto Izquierdo; courtesy of Francisco Barradas Solas, Science in School)

    A multi-ringed, oval shaped pollen corona surrounds the Sun on May 30, 2015 as seen from northern Minnesota. The white spots are aspen seeds, better known as “cotton fluff”, and unrelated to the corona. Credit: Bob King

    Lunar pollen corona. Taken 2008-06-22. The shape of the corona is caused by elongated pollen grains that orient themselves as they drift in the wind. (Credit: Bob King)

    Grand Canyon Parashant National Monument. An exquisite view of the Milky Way in a dark desert sky. (Credit: Bob Wick, Bureau of Land Management)

    Precession. In this diagram you can see the North Pole points towards Polaris. During 26,000 the direction the Pole points changes gradually. The changes form a small circle, even though it looks big in this picture. That means the Pole points to slightly different parts of the night sky, and the pole star changes. Mona Evans, "Polaris - Facts for Kids" www.bellaonline.c...

    Lightning over Oberstdorf in Allgäu, Germany. (May 2015) Credit: Jonathan Besler

    Fireflies and southern hemisphere stars at Lake Natron in Tanzania. 2015.02.24. You can see the stars of the southern Milky Way. Near the top, slightly left of center, is the Southern Cross. Just below and to the left of that are the two bright stars Alpha and Beta Centauri. But I think the stars aren't the stars, but the fireflies whose trails show up bright yellow. (Image credit and copyright: Steed Yu &

    Bright Venus and the Pleiades star cluster just to its upper right. If you look at the top of the image just to the left of center you can see the V-shaped Hyades star cluster. April 10, 2015. (Photo: Danny Crocker-Jensen)

    Venus glides up to the Pleiades or Seven Sisters star cluster this week. This was the view at dusk on April 4. Credit: Bob King

    Space Station Flies Over Super Typhoon Maysak. 2015.03.31. Maysak had strengthened into a super typhoon, reaching Category 5 hurricane status on the Saffir-Simpson Wind Scale. ESA Astronaut Samantha Cristoforetti captured this image.

    The Scream (1893) by Edvard Munch (National Gallery, Oslo, Norway) It's likely that this brilliant sky came from the memory of seeing such a sky soon after the eruption of Krakatoa. Mona Evans, "Celestial Sleuth - book review" www.bellaonline.c...

    The light from an aurora is caused by charged particles (mostly electrons) that come from inside the magnetosphere and then speed up to very high speeds as they barrel down along magnetic field-lines into the upper atmosphere. As they collide with the gas, they excite the atoms and molecules, which emit light when they relax from their excited state. (Credit: UC Regents)

    Mt. Rainier, Washington 2013-07-12. The green tinge isn't an aurora, it's airglow. Unlike aurorae, airglow covers the entire planet and is there all the time, caused by reactions between solar energy and certain air molecules. It's just not visible in daytime due to sunlight and is hard to spot at night from other light pollution. (Credit: Darren Neupert)

    Skies over ESO at La Silla. Composite image made from a series of long exposures taken in January 2015. It shows Comet Lovejoy, glowing green in the center; the Pleiades above & to the right; the red California Nebula to the right & level with the comet; the streak of a meteor to the left of the comet. (Image: P. Horálek/ESO)

    The February 2015 new Moon over Antelope Valley, California. (Credit and copyright: Gavin Heffernan)

    2015-01-09. An annotated version of Joshua Thomas's photo taken in Red River, New Mexico. The National Weather Service at La Crosse, Wiconsin provided the labeling for the various atmospheric phenomena shown in this amazing picture.

    Ice halo phenomena in Red River, New Mexico on 2015-01-10. (Credit: Joshua Thomas) This is absolutely stunning.

    An inferior planet is in inferior conjunction when it's lined up between Earth and the Sun. It's in superior conjunction when it's on the opposite side of the Sun from Earth. A superior planet is in conjunction when it's on the opposite side of the Sun from Earth. A superior planet can't have an inferior conjunction. When Earth is at inferior conjunction with respect to a superior planet, from our perspective that planet is in opposition.

    You couldn't miss Mercury and Venus together last night January 9th 45 minutes after sunset in the southwestern sky. Very easy to see! They'll be even closer tonight. (Credit: Bob King)