Public Posts

NASA Astronomy Picture of the Day:

Why does Comet ATLAS have such colorful tails? Last week Comet C/2024 G3 (ATLAS) passed its closest to the Sun -- well inside the orbit of Mercury -- and brightened dramatically. Unfortunately, the comet was then so angularly near the Sun that it was very hard for humans to see. But NASA's SOHO spacecraft saw it. Pictured is a SOHO (LASCO C3) image of Comet ATLAS that is a composite of several different color filters. Of the several tails visible, the central white tails are likely made of dust and just reflecting back sunlight. The red, blue, and green tails are likely ion tails with their colors dominated by light emitted by specific gases that were ejected from the comet and energized by the Sun. Currently, Comet ATLAS is showing long tails in southern skies but fading as it moves out of the inner Solar System. Growing Gallery: Comet ATLAS (G3)

Scientific diagram of arteries, veins, and capillaries. Also shows cross-sectional area differences.

Kelvinsong, CC BY-SA 3.0, via Wikimedia Commons. View source.

"A new Pew Research Center survey of 36 nations finds widespread public concern about economic inequality. And when asked what leads to this inequality, most people across the countries surveyed point to the intersection of wealth and politics" More at Pew Research Center ➜

James Arthur Baldwin (1924 –1987) was an American writer, orator and activist. As a writer, he garnered acclaim across various mediums, including essays, novels, plays, and poems. His first novel, Go Tell It on the Mountain, was published in 1953; decades later, Time magazine included the novel on its list of the 100 best English-language novels released from 1923 to 2005. His first essay collection, Notes of a Native Son, was published in 1955. Baldwin was also a well-known, and controversial, public figure, especially during the civil rights movement in the United States.

NASA Astronomy Picture of the Day:

What would it look like to land on Saturn's moon Titan? The European Space Agency's Huygens probe set down on the Solar System's cloudiest moon in 2005, and a time-lapse video of its descent images was created. Huygens separated from the robotic Cassini spacecraft soon after it achieved orbit around Saturn in late 2004 and began approaching Titan. For two hours after arriving, Huygens plummeted toward Titan's surface, recording at first only the shrouded moon's opaque atmosphere. The computerized truck-tire sized probe soon deployed a parachute to slow its descent, pierced the thick clouds, and began transmitting images of a strange surface far below never before seen in visible light. Landing in a dried sea and surviving for 90 minutes, Huygen's returned unique images of a strange plain of dark sandy soil strewn with smooth, bright, fist-sized rocks of ice.

Hellenic pond turtle (Emys orbicularis hellenica), Butrint Archaeological Park, Albania.

Charles J. Sharp, CC BY-SA 4.0, via Wikimedia Commons. View source.

NASA Astronomy Picture of the Day:

On January 13 a Full Moon and a Full Mars were close, both bright and opposite the Sun in planet Earth's sky. In fact Mars was occulted, passing behind the Moon, when viewed from some locations in North America and northwest Africa. As seen from Richmond, Virginia, USA, this composite image sequence follows the evening lunar occultation before, during, and after the much anticipated celestial spectacle. The telescopic time series is constructed from an exposure made every two minutes while tracking the Moon over the hours encompassing the event. As a result, the Red Planet's trajectory seems to follow a gently curved path due to the Moon's slightly different rate of apparent motion. The next lunar occultation of bright planet Mars will be on February 9 when the moon is in a waxing gibbous phase. Lunar occultations are only ever visible from a fraction of the Earth's surface, though. The February 9 occultation of Mars will be seen from parts of Russia, China, eastern Canada, Greenland and other (mostly northern) locations, but a close conjunction of a bright Moon with Mars will be more widely visible from planet Earth. Growing Gallery: Moon-Mars Occultation in January 2025

Photo by On January 13

Detail view of a crane in the harbour, Waterfront, Cape Town, Western Cape, South Africa.

Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons. View source.