APOD: 2023-10-15 - An Eclipse Tree (Narrated by Brian)
Astronomy Picture of the Day - October 15th, 2023 - An Eclipse Tree (Narrated by Brian)
Yes, but can your tree do this? If you look closely at the ground in the featured image, you will see many images of yesterday's solar eclipse -- created by a tree. Gaps between tree leaves act like pinhole lenses and each create a small image of the partially eclipsed Sun visible in the other direction. The image was taken in Burleson, Texas, USA. Yesterday, people across the Americas were treated to a partial eclipse of the Sun, when the Moon moves in front of part of the Sun. People in a narrow band of Earth were treated to an annular eclipse, also called a ring-of-fire eclipse, when the Moon becomes completely engulfed by the Sun and sunlight streams around all of the Moon's edges. In answer to the lede question, your tree not only can do this, but will do it every time that a visible solar eclipse passes overhead. Next April 8, a deeper, total solar eclipse will move across North America. Album: Selected eclipse images sent in to APOD
Astronomy Picture of the Day - December 1st, 2021 - A Blue-Banded Blood Moon (Narrated by Salli)
What causes a blue band to cross the Moon during a lunar eclipse? The blue band is real but usually quite hard to see. The featured HDR image of last week's lunar eclipse, however -- taken from Yancheng, China -- has been digitally processed to equalize the Moon's brightness and exaggerate the colors. The gray color of the bottom right is the Moon's natural color, directly illuminated by sunlight. The upper left part of the Moon is not directly lit by the Sun since it is being eclipsed -- it in the Earth's shadow. It is faintly lit, though, by sunlight that has passed deep through Earth's atmosphere. This part of the Moon is red -- and called a blood Moon -- for the same reason that Earth's sunsets are red: because air scatters away more blue light than red. The unusual blue band is different -- its color is created by sunlight that has passed high through Earth's atmosphere, where red light is better absorbed by ozone than blue. A total eclipse of the Sun will occur tomorrow but, unfortunately, totality be visible only near the Earth's South Pole. Almost Hyperspace: Random APOD Generator
Source: https://apod.nasa.gov/apod/ap211201.html
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https://www.youtube.com/watch?v=ieAo7c3Qp-I
Astronomy Picture of the Day - February 13th, 2020 - Spitzer's Trifid (Narrated by Joanna)
The Trifid Nebula, also known as Messier 20, is easy to find with a small telescope. About 30 light-years across and 5,500 light-years distant it's a popular stop for cosmic tourists in the nebula rich constellation Sagittarius. As its name suggests, visible light pictures show the nebula divided into three parts by dark, obscuring dust lanes. But this penetrating infrared image reveals the Trifid's filaments of glowing dust clouds and newborn stars. The spectacular false-color view is courtesy of the Spitzer Space Telescope. Astronomers have used the infrared image data to count newborn and embryonic stars which otherwise can lie hidden in the natal dust and gas clouds of this intriguing stellar nursery. Launched in 2003, Spitzer explored the infrared Universe from an Earth-trailing solar orbit until its science operations were brought to a close earlier this year, on January 30.
Source: https://apod.nasa.gov/apod/ap200213.html
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https://www.youtube.com/watch?v=ujiDLnApJK8
Wikipedia Picture of the Day - May 5th, 2021 - Sun (Narrated by Matthew)
The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear-fusion reactions in its core, radiating the energy mainly as visible light and infrared radiation. It is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometres (860,000 mi), or 109 times that of Earth. Its mass is about 330,000 times that of Earth, and accounts for about 99.86 percent of the total mass of the Solar System. Roughly three-quarters of the Sun's mass consists of hydrogen; the rest is mostly helium, with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron. This diagram illustrates the general structure of the Sun, with all features drawn to scale.
Diagram credit: Kelvin Ma
Source: https://en.wikipedia.org/wiki/Template:POTD/2021-05-05
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https://www.youtube.com/watch?v=-cSt_Uth0OU
Astronomy Picture of the Day - August 18th, 2022 - Full Moon Perseids (Narrated by Joanna)
The annual Perseid meteor shower was near its peak on August 13. As planet Earth crossed through streams of debris left by periodic Comet Swift-Tuttle meteors rained in northern summer night skies. But even that night's nearly Full Moon shining near the top of this composited view couldn't hide all of the popular shower's meteor streaks. The image captures some of the brightest perseid meteors in many short exposures recorded over more than two hours before the dawn. It places the shower's radiant in the heroic constellation of Perseus just behind a well-lit medieval tower in the village of Sant Llorenc de la Muga, Girona, Spain. Observed in medieval times, the Perseid meteor shower is also known in Catholic tradition as the Tears of St. Lawrence, and festivities are celebrated close to the annual peak of the meteor shower. Joining the Full Moon opposite the Sun, bright planet Saturn also shines in the frame at the upper right.
Image Credit & Copyright: Juan Carlos Casado
Source: https://apod.nasa.gov/apod/ap220818.html
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https://www.youtube.com/watch?v=Y19hHXXcyGc
Astronomy Picture of the Day - January 2nd, 2023 - After Sunset Planet Parade (Narrated by Emma)
Look up tonight and see a whole bunch of planets. Just after sunset, looking west, planets Venus, Saturn, Jupiter and Mars will all be simultaneously visible. Listed west to east, this planetary lineup will have Venus nearest the horizon, but setting shortly after the Sun. It doesn't matter where on Earth you live because this early evening planet parade will be visible through clear skies all around the globe. Taken late last month, the featured image captured all of these planets and more: the Moon and planet Mercury were also simultaneously visible. Below visibility were the planets Neptune and Uranus, making this a nearly all-planet panorama. In the foreground are hills around the small village of Gökçeören, Kaş, Turkey, near the Mediterranean coast. Bright stars Altair, Fomalhaut, and Aldebaran are also prominent, as well as the Pleiades star cluster. Venus will rise higher in the sky at sunset as January continues, but Saturn will descend.
Image Credit & Copyright: Tunc Tezel
Source: https://apod.nasa.gov/apod/ap230102.html
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https://www.youtube.com/watch?v=LpFKskUVaSY
Astronomy Picture of the Day - July 3rd, 2020 - Lynds Dark Nebula 1251 (Narrated by Brian)
Stars are forming in Lynds Dark Nebula (LDN) 1251. About 1,000 light-years away and drifting above the plane of our Milky Way galaxy, the dusty molecular cloud is part of a complex of dark nebulae mapped toward the Cepheus flare region. Across the spectrum, astronomical explorations of the obscuring interstellar clouds reveal energetic shocks and outflows associated with newborn stars, including the telltale reddish glow from scattered Herbig-Haro objects seen in this sharp image. Distant background galaxies also lurk on the scene, buried behind the dusty expanse. This alluring view imaged with a backyard telescope and broadband filters spans about two full moons on the sky, or 17 light-years at the estimated distance of LDN 1251.
Image Credit & Copyright: Ara Jerahian
Source: https://apod.nasa.gov/apod/ap200703.html
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https://www.youtube.com/watch?v=QGxnyJWPUi8
Wikipedia Picture of the Day - May 1st, 2023 - Divje Babe flute (Narrated by Brian)
The Divje Babe flute, also sometimes called the tidldibab or Neanderthal flute, is the femur of a cave bear, which is pierced by spaced holes similar to those found on a flute. The object was unearthed at Divje Babe I, a cave site near Cerkno in northwestern Slovenia in 1995, during systematic archaeological excavations in the area. It is possible that it was made by Neanderthals as a form of musical instrument, although this theory is debated by scientists: some argue that the holes in the bone were artificially made by Neanderthals, while others say they were made by carnivores. If confirmed as a musical instrument, it would be the oldest-known Paleolithic flute and musical instrument. The object is now in the collection of the National Museum of Slovenia in Ljubljana.
Photograph credit: Petar Milošević
Source: https://en.wikipedia.org/wiki/Template:POTD/2023-05-01
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https://www.youtube.com/watch?v=tsO5SRo4qY8
Astronomy Picture of the Day - September 1st, 2022 - The Tulip and Cygnus X-1 (Narrated by Joanna)
Framing a bright emission region, this telescopic view looks out along the plane of our Milky Way Galaxy toward the nebula rich constellation Cygnus the Swan. Popularly called the Tulip Nebula, the reddish glowing cloud of interstellar gas and dust is also found in the 1959 catalog by astronomer Stewart Sharpless as Sh2-101. Nearly 70 light-years across, the complex and beautiful Tulip Nebula blossoms about 8,000 light-years away. Ultraviolet radiation from young energetic stars at the edge of the Cygnus OB3 association, including O star HDE 227018, ionizes the atoms and powers the emission from the Tulip Nebula. Also in the field of view is microquasar Cygnus X-1, one of the strongest X-ray sources in planet Earth's sky. Blasted by powerful jets from a lurking black hole its fainter bluish curved shock front is only just visible though, beyond the cosmic Tulip's petals near the right side of the frame. Back to School? Learn Science with NASA
Image Credit & Copyright: Peter Kohlmann
Source: https://apod.nasa.gov/apod/ap220901.html
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https://www.youtube.com/watch?v=Dcj9gwfQpjE
Wikipedia Picture of the Day - January 6th, 2023 - Bay Area Rapid Transit (Narrated by Brian)
Bay Area Rapid Transit is a rapid transit system serving the San Francisco Bay Area in California. It serves fifty stations along six routes on 131 miles (211 kilometers) of rapid transit lines, including a spur line to Antioch that uses diesel multiple unit trains, and an automated guideway transit line to Oakland International Airport. The system had 26,026,800 passengers in 2021. This photograph, captured by a line-scan camera using strip photography, shows the length of a nine-car Bay Area Rapid Transit train comprising four C1 cars and five B2 cars.
Photograph credit: Daniel Lawrence Lu
Source: https://en.wikipedia.org/wiki/Template:POTD/2023-01-06
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https://www.youtube.com/watch?v=zWaatvtHQ8s