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APOD: 2021-03-30 - Red Sprite Lightning over the Andes (Narrated by Amy)
Astronomy Picture of the Day - March 30th, 2021 - Red Sprite Lightning over the Andes (Narrated by Amy)
What are those red filaments in the sky? They are a rarely seen form of lightning confirmed only about 30 years ago: red sprites. Recent research has shown that following a powerful positive cloud-to-ground lightning strike, red sprites may start as 100-meter balls of ionized air that shoot down from about 80-km high at 10 percent the speed of light. They are quickly followed by a group of upward streaking ionized balls. The featured image was taken earlier this year from Las Campanas observatory in Chile over the Andes Mountains in Argentina. Red sprites take only a fraction of a second to occur and are best seen when powerful thunderstorms are visible from the side. APOD via Instagram in: English, Indonesian, Persian, and Portuguese
Image Credit & Copyright: Yuri BeletskyCarnegieLas Campanas ObservatoryTWAN
Source: https://apod.nasa.gov/apod/ap210330.html
This video was auto generated using data from NASA Open API.
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https://www.youtube.com/watch?v=XSIZ_wy6Na4
What are those red filaments in the sky? They are a rarely seen form of lightning confirmed only about 30 years ago: red sprites. Recent research has shown that following a powerful positive cloud-to-ground lightning strike, red sprites may start as 100-meter balls of ionized air that shoot down from about 80-km high at 10 percent the speed of light. They are quickly followed by a group of upward streaking ionized balls. The featured image was taken earlier this year from Las Campanas observatory in Chile over the Andes Mountains in Argentina. Red sprites take only a fraction of a second to occur and are best seen when powerful thunderstorms are visible from the side. APOD via Instagram in: English, Indonesian, Persian, and Portuguese
Image Credit & Copyright: Yuri BeletskyCarnegieLas Campanas ObservatoryTWAN
Source: https://apod.nasa.gov/apod/ap210330.html
This video was auto generated using data from NASA Open API.
...
https://www.youtube.com/watch?v=XSIZ_wy6Na4
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Wikipedia Picture of the Day - September 16th, 2023 - Arena of Nîmes (Narrated by Amy)
The Arena of Nîmes is a Roman amphitheatre situated in the French city of Nîmes. Built around 100 CE, shortly after the Colosseum in Rome, it is one of the best-preserved Roman amphitheatres in the world. It is also among the twenty largest Roman amphitheatres of the 400 in existence. It is 133 metres long (145 yd) and 101 metres wide (110 yd), with an arena measuring 68 metres by 38 metres (74 yd by 42 yd). The outer facade is 21 metres high (69 ft) with two stories of 60 arcades. Today, the amphitheatre is the site of two annual bullfights during the Feria de Nîmes, and it is used for other public events such as historical reenactments and concerts. This photograph of the exterior of the amphitheatre was taken in 2019.
Photograph credit: Krzysztof Golik; edited by Janke
Source: https://en.wikipedia.org/wiki/Template:POTD/2023-09-16
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Astronomy Picture of the Day - October 24th, 2022 - Clouds Around Galaxy Andromeda (Narrated by Emma)
What are those red clouds surrounding the Andromeda galaxy? This galaxy, M31, is often imaged by planet Earth-based astronomers. As the nearest large spiral galaxy, it is a familiar sight with dark dust lanes, bright yellowish core, and spiral arms traced by clouds of bright blue stars. A mosaic of well-exposed broad and narrow-band image data, this deep portrait of our neighboring island universe offers strikingly unfamiliar features though, faint reddish clouds of glowing ionized hydrogen gas in the same wide field of view. Most of the ionized hydrogen clouds surely lie in the foreground of the scene, well within our Milky Way Galaxy. They are likely associated with the pervasive, dusty interstellar cirrus clouds scattered hundreds of light-years above our own galactic plane. Some of the clouds, however, occur right in the Andromeda galaxy itself, and some in M110, the small galaxy just below.
Image Credit & Copyright: Andrew Fryhover
Source: https://apod.nasa.gov/apod/ap221024.html
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Astronomy Picture of the Day - April 1st, 2022 - Leaning Tower, Active Sun (Narrated by Brian)
The natural filter of a hazy atmosphere offered this recognizable architecture and sunset view on March 27. Dark against the solar disk, large sunspots in solar active regions 2975 and 2976 are wedged between the Duomo of Pisa and its famous Leaning Tower. Only one day later, Sun-staring spacecraft watched active region 2975 unleash a frenzy of solar flares along with two coronal mass ejections. The largest impacted the magnetosphere on March 31 triggering a geomagnetic storm and aurorae in high-latitude night skies. On March 30, active region 2975 erupted again with a powerful X-class solar flare that caused a temporary radio blackout on planet Earth.
Image Credit & Copyright: Antonio Tartarini
Source: https://apod.nasa.gov/apod/ap220401.html
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Astronomy Picture of the Day - December 21st, 2021 - Solstice Sun and Milky Way (Narrated by Amy)
Welcome to December's solstice, first day of winter in the north and summer for the southern hemisphere. Astronomical markers of the seasons, solstice and equinox dates are based on the Sun's place in its annual journey along the ecliptic, through planet Earth's sky. At this solstice, the Sun reaches its maximum southern declination of -23.5 degrees today at 15:59 UTC, while its right ascension coordinate on the celestial sphere is 18 hours. That puts the Sun in the constellation Sagittarius in a direction near the center of our Milky Way galaxy. In fact, if you could see today's Solstice Sun against faint background stars and nebulae (that's really hard to do, especially in the daytime ...) your view might look something like this composited panorama. To make it, images of our fair galaxy were taken under dark Namibian night skies, then stitched together in a panoramic view. From a snapshot made on 2015 December 21, the Sun was digitally overlayed as a brilliant star at today's northern winter solstice position, close to the center of the Milky Way. Discovery + Outreach: Graduate student research position open for APOD
Image Credit & Copyright: Stefan Seip
Source: https://apod.nasa.gov/apod/ap211221.html
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Astronomy Picture of the Day - November 14th, 2021 - How to Identify that Light in the Sky (Narrated by Brian)
What is that light in the sky? Perhaps one of humanity's more common questions, an answer may result from a few quick observations. For example -- is it moving or blinking? If so, and if you live near a city, the answer is typically an airplane, since planes are so numerous and so few stars and satellites are bright enough to be seen over the din of artificial city lights. If not, and if you live far from a city, that bright light is likely a planet such as Venus or Mars -- the former of which is constrained to appear near the horizon just before dawn or after dusk. Sometimes the low apparent motion of a distant airplane near the horizon makes it hard to tell from a bright planet, but even this can usually be discerned by the plane's motion over a few minutes. Still unsure? The featured chart gives a sometimes-humorous but mostly-accurate assessment. Dedicated sky enthusiasts will likely note -- and are encouraged to provide -- polite corrections. Chart translations: Spanish, Italian, Polish, Kannada, Latvian, Norwegian, and Turkish
Image Credit & Copyright: The League of Lost Causes
Source: https://apod.nasa.gov/apod/ap211114.html
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Astronomy Picture of the Day - November 11th, 2020 - Colors of the Moon (Narrated by Salli)
What color is the Moon? It depends on the night. Outside of the Earth's atmosphere, the dark Moon, which shines by reflected sunlight, appears a magnificently brown-tinged gray. Viewed from inside the Earth's atmosphere, though, the moon can appear quite different. The featured image highlights a collection of apparent colors of the full moon documented by one astrophotographer over 10 years from different locations across Italy. A red or yellow colored moon usually indicates a moon seen near the horizon. There, some of the blue light has been scattered away by a long path through the Earth's atmosphere, sometimes laden with fine dust. A blue-colored moon is more rare and can indicate a moon seen through an atmosphere carrying larger dust particles. What created the purple moon is unclear -- it may be a combination of several effects. The last image captures the total lunar eclipse of 2018 July -- where the moon, in Earth's shadow, appeared a faint red -- due to light refracted through air around the Earth. The next full moon will occur at the end of this month (moon-th) and is known in some cultures as the Beaver Moon.
Image Credit & Copyright: Marcella Giulia Pace
Source: https://apod.nasa.gov/apod/ap201111.html
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Astronomy Picture of the Day - July 2nd, 2023 - Milky Way and Aurora over Antarctica (Narrated by Brian)
It was one of the better skies of this long night. In parts of Antarctica, not only is it winter, but the Sun can spend weeks below the horizon. At China's Zhongshan Station, people sometimes venture out into the cold to photograph a spectacular night sky. The featured image from one such outing was taken in mid-July of 2015, just before the end of this polar night. Pointing up, the wide angle lens captured not only the ground at the bottom, but at the top as well. In the foreground, a colleague is taking pictures. In the distance, a spherical satellite receiver and several windmills are visible. Numerous stars dot the night sky, including Sirius and Canopus. Far in the background, stretching overhead from horizon to horizon, is the central band of our Milky Way Galaxy. Even further in the distance, visible as extended smudges near the top, are the Large and Small Magellanic Clouds, satellite galaxies near our huge Milky Way Galaxy. Explore the Universe: Random APOD Generator
Image Credit & Copyright:
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Source: https://apod.nasa.gov/apod/ap230702.html
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Wikipedia Picture of the Day - April 10th, 2023 - Project Mercury (Narrated by Brian)
Project Mercury was the first human-spaceflight program of the United States, running from 1958 through 1963. It was one of the first projects of NASA, which was created as a response to the Soviet Union's 1957 launch of Sputnik 1, the first satellite in Earth orbit. The program's goals were to orbit a crewed spacecraft around Earth, investigate the pilot's ability to function in space, and to recover both pilot and spacecraft safely. The Soviet Union won the race to put the first human into orbit when Yuri Gagarin traveled in Vostok 1 in 1961, while the US launched its first astronaut on a suborbital flight in the same year, and achieved crewed orbital flight in 1962 when John Glenn made three orbits around the Earth. The Mercury project's missions were followed by millions on radio and television around the world, and it laid the groundwork for Project Gemini, which carried two astronauts in each capsule and perfected space docking maneuvers essential for crewed lunar landings in the subsequent Apollo program, announced a few weeks after the first crewed Mercury flight. This NASA illustration compares the relative sizes and launch positions of the spacecraft and rockets of Project Mercury (small) with those of Gemini (medium) and Apollo (large).
Illustration credit: Davis Paul Meltzer
Source: https://en.wikipedia.org/wiki/Template:POTD/2023-04-10
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Astronomy Picture of the Day - January 11th, 2023 - Spiral Aurora over Iceland (Narrated by Salli)
The scene may look like a fantasy, but it's really Iceland. The rock arch is named Gatklettur and located on the island's northwest coast. Some of the larger rocks in the foreground span a meter across. The fog over the rocks is really moving waves averaged over long exposures. The featured image is a composite of several foreground and background shots taken with the same camera and from the same location on the same night last November. The location was picked for its picturesque foreground, but the timing was planned for its colorful background: aurora. The spiral aurora, far behind the arch, was one of the brightest seen in the astrophotographer's life. The coiled pattern was fleeting, though, as auroral patterns waved and danced for hours during the cold night. Far in the background were the unchanging stars, with Earth's rotation causing them to appear to slowly circle the sky's northernmost point near Polaris. Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)
Image Credit & Copyright: Stefano Pellegrini
Source: https://apod.nasa.gov/apod/ap230111.html
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