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https://www.gmanetwork.com/news/news/nation/638027/duterte-declares-every-december-8-a-special-non-working-holiday-in-phl/story/

Be updated! Tomorrow, December 8,2020 is a special non- working Holiday for the Feast of the Immaculate Conception.

Take care always and have a great day ahead!

Duterte declares December 8 a special non-working holiday in PHL President Rodrigo Duterte has declared December 8 of every year a special non-working holiday in the Philippines.  

Time for some dose of Astronomy.

• An Explanation for Saturn’s Hexagon
by Susanna Kohler - 17.11.2020

IMAGE: (See moving GIF of hexagon in post comments) The hexagon-shaped jet-stream is fully illuminated here. In this image, the planet appears darker in regions where the cloud deck is lower, such the region interior to the hexagon. Credit: NASA/JPL-Caltech/Space Science Institute
• For over three decades, we’ve been gathering observations of the mysterious hexagonal cloud pattern encircling Saturn’s north pole. Now, researchers believe they have a model that can better explain its formation.

- Fascinating Geometry:
Saturn’s northern Hexagon is a cloud band circling Saturn’s north pole at 78° N, first observed by the Voyager flybys in 1980–81. This remarkable pattern has now persisted for more than a Saturn year (29.5 Earth years).
Observations by Voyager and, more recently, Cassini have helped to identify many key characteristics of this bizarre structure. Two interesting things we’ve learned are:

1/ The Hexagon is associated with an eastward zonal jet moving at more than 200 mph.
The cause of the Hexagon is believed to be a jet stream, similar to the ones that we experience on Earth. The path of the jet itself appears to follow the hexagon’s outline.
2/ The Hexagon rotates at roughly the same rate as Saturn’s overall rotation.
While we observe individual storms and cloud patterns moving at different speeds within the Hexagon, the vertices of the Hexagon move at almost exactly the same rotational speed as that of Saturn itself.

Attempts to model the formation of the Hexagon with a jet stream have yet to fully reproduce all of the observed features and behavior. But now, a team led by Raúl Morales-Juberías of the New Mexico Institute of Mining and Technology believes they have created a model that better matches what we see.

• Continue Reading: https://aasnova.org/2015/08/21/an-explanation-for-saturns-hexagon/

• Research PAPER: "Meandering shallow atmospheric jet as a model of saturnʼs north-polar hexagon" R. Morales-Juberías et al, 2015: https://iopscience.iop.org/article/10.1088/2041-8205/806/1/L18

• For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov

• Image Credit: NASA/JPL-Caltech/Space Science Institute

. “One learns from books and example only that certain things can be done. Actual learning requires that you do those things.”

– Frank Herbert

IC 4593 • A Cosmic Amethyst in a Dying Star
12.11.2020

• Chandra has found a bubble of ultra-hot gas at the center of a planetary nebula. (Descriptive video in post comments)
• Planetary nebulas are formed when Sun-like stars run out of fuel, shedding their outer layers while the star's core shrinks.
• This image contains X-rays from Chandra (purple) and optical light data from Hubble (pink and green).
• IC 4593 is at a distance of about 7,800 light years from Earth, which is the farthest planetary nebula detected by Chandra.

On Earth, amethysts can form when gas bubbles in lava cool under the right conditions. In space, a dying star with a mass similar to the Sun is capable of producing a structure on par with the appeal of these beautiful gems.

As stars like the Sun run through their fuel, they cast off their outer layers and the core of the star shrinks. Using NASA's Chandra X-ray Observatory, astronomers have found a bubble of ultra-hot gas at the center of one of these expiring stars, a planetary nebula in our galaxy called IC 4593. At a distance of about 7,800 light years from Earth, IC 4593 is the most distant planetary nebula yet detected with Chandra.

This new image of IC 4593 has X-rays from Chandra in purple, invoking similarities to amethysts found in geodes around the globe. The bubble detected by Chandra is from gas that has been heated to over a million degrees. These high temperatures were likely generated by material that blew away from the shrunken core of the star and crashed into gas that had previously been ejected by the star.

This composite image also contains visible light data from the Hubble Space Telescope (pink and green). The pink regions in the Hubble image are the overlap of emission from cooler gas composed of a combination of nitrogen, oxygen, and hydrogen, while the green emission is mainly from nitrogen.

• Continue Reading: https://chandra.si.edu/photo/2020/ic4593/

• Research PAPER: "Chandra observations of the planetary nebula IC 4593"
J.A. Toalá et al, 2020: https://arxiv.org/abs/2004.04542

• Credit: X-ray: NASA/CXC/UNAM/J. Toalá et al.; Optical: NASA/STScI

Be updated.

Suspendido na po ang lahat ng klase sa lahat ng antas sa mga PAMPUBLIKO AT PRIBADONG PAARALAN bukas, November 12, 2020. Stay safe po!

Even if we are far from each other, we still able to work hard for a better future.

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