Profile cover photo
Profile photo
Pierre Markuse
29,963 followers -
Never stop being curious...
Never stop being curious...

29,963 followers
About
Pierre Markuse's posts

Post has attachment
Earth from Space: Yukon River Delta, Alaska, USA

In this composite image you can see a part of the Yukon River delta, Alaska, USA, imaged by the Operational Land Imager (OLI) aboard Landsat 8. The images were taken in May 2017.

Here you can see a part of the larger Yukon–Kuskokwim Delta (https://goo.gl/7ZrwUF) in Alaska, USA. The Kuskokwim (https://goo.gl/DrDPU6) is located to the south of this image. The Yukon River (https://goo.gl/fEFGzA) is the longest river in Alaska and Yukon and empties into the Bering Sea (https://goo.gl/2hpJBw).

The image is a combination of a natural color image with an infrared image, to better show differences in the soil and vegetation. The otherwise very brownish landscape at that time of the year is looking green and orange this way. Use the links below to see a natural color version.

You can see and download a full-size version (15 meters/pixel resolution) of this image, and other version here:
https://flic.kr/p/VHun53 (Natural colors NIR/SWIR false color mix)
https://flic.kr/p/WMVXTX (NIR/SWIR view)
https://flic.kr/p/VLeDaR (Natural colors)

The area on Google maps:
https://goo.gl/8Lf6iE

Technical Data

For those interested, here the technical data for this image. The image is a combination of a pansharpened OLI Band 4-3-2 (natural color) image and a Band 7-5-1 NIR/SWIR image. Colors are meant to better show vegetation differences, contrast is slightly enhanced. Image scale is 72 meters/pixel.

More Images of Earth from Space:

You can find more images of Earth from Space in my latest collection post here (https://goo.gl/pir7pU). Even more images can be found on my Flickr here (https://www.flickr.com/photos/pierre_markuse/).

More on Landsat 8:
http://landsat.gsfc.nasa.gov/?page_id=407
https://en.wikipedia.org/wiki/Landsat_8

Image credit: Yukon River Delta, Alaska, USA Landsat 8 data courtesy of U.S. Geological Survey / Processed by +Pierre Markuse

Thank you for your interest in this Space/Space technology collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Astronomy/Astrophysics collection here: https://goo.gl/x0zPAJ

#science #earth #usa #alaska #yukon #yukonriver #delta #space #landsat #landsat8 #satelliteimages #spacetechnology #photography 
Photo

Post has attachment
NGC 7098 - Double Barred Spiral Galaxy

In this image, taken by ESO’s Very Large Telescope at Paranal Observatory, you can see NGC 7098. It is a double barred spiral galaxy, located in the constellation of Octans (The Octant, https://goo.gl/79w77R), about 104 million light-years away from Earth. It has a diameter of about 150,000 light-years.

The galaxy looks as if two rings would be draped around around the luminous core. Those are the galaxy's spiral arms appearing like rings. These arms have multiple regions with ongoing star formation (https://goo.gl/Mn2Zxf). At the core of the galaxy there is a double bar.

Visible in the distance are more galaxies, the edge-on spiral galaxy you can see at the bottom is ESO 048-G007.

NGC 7098 was discovered September 22nd, 1835, by the English astronomer John Herschel (https://goo.gl/WCo123).

More information here:
http://www.eso.org/public/images/potw1730a/
https://en.wikipedia.org/wiki/NGC_7098

Barred Spiral Galaxy

Barred spiral galaxies are spiral galaxies with central bar-shaped structures composed of stars. Our Milky Way Galaxy (https://goo.gl/aklgg) is a barred spiral galaxy. More information here:
https://en.wikipedia.org/wiki/Barred_spiral_galaxy

More on the morphological classification of galaxies:
https://en.wikipedia.org/wiki/Galaxy_morphological_classification

Image credit: NGC 7098 ESO https://goo.gl/EbcF77 CC BY 4.0 https://goo.gl/hNRHCd

Thank you for your interest in this Astronomy/Astrophysics collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Space/Space Technology collection here: https://goo.gl/5KP0wx

#science #astronomy #ngc7098 #galaxy #barredspiralgalaxy #spiralgalaxy #starformation #eso #vlt #space
Photo

Post has attachment
Thawing permafrost releases old geologic methane

A study conducted by scientists from the German Research Centre for Geosciences GFZ, the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) and partners in the US concludes that, due to permafrost thaw, hydrocarbon-rich areas, prevalent in the Arctic, may see increased emission of geologic methane in the future, in addition to enhanced microbial methane production.

This methane will contribute to the greenhouse effect and higher temperatures will further increase the microbial methane production and possibly open new and more pathways for the geologic methane to migrate to the surface.

Methane (https://goo.gl/p68GYt) is a potent greenhouse gas (https://goo.gl/BPjgBn) that contributes to atmospheric warming, and is approximately 25 times more potent per molecule than carbon dioxide over a 100-year period.

More information here:
https://www.sciencedaily.com/releases/2017/07/170719084810.htm

Paper:
Strong geologic methane emissions from discontinuous terrestrial permafrost in the Mackenzie Delta, Canada
https://www.nature.com/articles/s41598-017-05783-2

This NASA Earth Observatory article on global warming is answering some of the most asked questions:
http://earthobservatory.nasa.gov/Features/GlobalWarming/

If you yourself or friends have doubts about climate change, I also recommend to watch this video, addressing some common misconceptions: 13 Misconceptions About Global Warming http://youtu.be/OWXoRSIxyIU

Image credit: Mackenzie River Delta Landsat 8 data courtesy of U.S. Geological Survey, processed by +Pierre Markuse https://flic.kr/p/QFWJa5

Thank you for your interest in this Climate Change/Earth collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Astronomy/Astrophysics collection here: https://goo.gl/x0zPAJ or the Space/Space Technology collection here: https://goo.gl/5KP0wx

#science #earth #arctic #permafrost #methane #ch4 #climate #climatechange #mackenzie #greenhousegas #greenhouseeffect
Photo

Post has attachment
Earth from Space: Wildfires near Split, Croatia

In this composite image you can see wildfires near Split, Croatia, imaged by the Multi-Spectral Instrument (MSI) aboard the Sentinel-2A satellite. The images were taken July 17th, 2017.

Clearly visible is the smoke cloud produced by the fire. NIR/SWIR highlights in yellow and red are showing areas with possible ongoing or recent fires.

You can see and download a full-size version (10 meters/pixel) of this image and additional images here:
https://flic.kr/s/aHskZFFL9G

The area on Google maps:
https://goo.gl/9FuVks

Technical Data

For those interested, here the technical data for this image. The image is a MSI Band 4-3-2 (natural color) image with NIR/SWIR highlights to show hotter areas with possible fires. The resulting colors are near natural (except the highlights), contrast is slightly enhanced. Image scale is 10 meters/pixel.

More Images of Earth from Space:

You can find more images of Earth from Space in my latest collection post here (https://goo.gl/pir7pU). Even more images can be found on my Flickr here (https://www.flickr.com/photos/pierre_markuse/).

More on the Copernicus programme aimed at observing the Earth:
http://www.esa.int/Our_Activities/Observing_the_Earth/Copernicus
https://en.wikipedia.org/wiki/Copernicus_Programme

More on the Sentinel-2A satellite:
https://earth.esa.int/web/guest/missions/esa-future-missions/sentinel-2
https://en.wikipedia.org/wiki/Sentinel-2A

Image credit: Wildfires near Split, Croatia Contains modified Copernicus Sentinel data [2017], processed by +Pierre Markuse

Thank you for your interest in this Space/Space technology collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Astronomy/Astrophysics collection here: https://goo.gl/x0zPAJ

#science #earth #wildfire #split #croatia #smoke #smokeplume #space #sentinel #sentinel2 #esa #satelliteimages #spacetechnology #photography
Photo

Post has attachment
RCW 38 Star Cluster with Brown Dwarfs

In this image, taken by the NACO adaptive optics infrared camera on ESO’s Very Large Telescope, you can see RCW 38. It is an embedded cluster (https://goo.gl/93KdpF) in the constellation of Vela (The Sail, https://goo.gl/0d1Yig) about 5,500 light-years away from Earth.

In the insets you can see several possible brown dwarfs. Those brown dwarfs have more mass than a planet, but not enough mass to sustain hydrogen fusion.

Scientists found half as many brown dwarfs as stars in the cluster. There might be even more browns dwarfs hidden to us, because the instruments aren't sensitive enough to pick them all up. Scientists estimate that our Milky Way Galaxy (https://goo.gl/aklgg) contains at least between 25 to 100 billion brown dwarfs.

More information here:
http://www.eso.org/public/images/potw1729a/

What is a brown dwarf?

Brown dwarfs are substellar objects (https://goo.gl/ZRhdmo) with masses above those of planets but below those of even the lightest stars. They are not massive enough to sustain hydrogen-1 fusion reactions in their cores, but depending on their mass some of them fuse deuterium and lithium. More information here:
https://en.wikipedia.org/wiki/Brown_dwarf

More on brown dwarfs here in this explanatory video:
Brown Dwarfs: Crash Course Astronomy #28
https://youtu.be/4zKVx29_A1w

Hey, help me out here, will you? I would like to see how many people actually read the information here that comes with the images. So if you have read this, please comment the word "Pudding", either on its own, or include it in your comment. Thank you!

Image credit: RCW 38 with brown dwarfs ESO/Koraljka Muzic (University of Lisbon), Aleks Scholz (University of St Andrews), Rainer Schoedel (Institituto de Astrofísica de Andalucía), Vincent Geers (UKATC), Ray Jayawardhana (York University), Joana Ascenso (Univeristy of Porto & University of Lisbon) & Lucas Cieza (University Diego Portales) https://goo.gl/zDgj7e CC BY 4.0 https://goo.gl/hNRHCd

Thank you for your interest in this Astronomy/Astrophysics collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Space/Space Technology collection here: https://goo.gl/5KP0wx

#science #astronomy #astrophysics #rcw38 #starcluster #browndwarf #naco #eso #vlt #space #substellarobject
Photo

Post has attachment
NGC 4242 - Barred Spiral Galaxy

In this image, taken by the Hubble Space Telescope, you can see NGC 4242. It is a barred spiral galaxy, located in the constellation of Canes Venatici (The Hunting Dogs, https://goo.gl/fuxi94), about 30 million light-years away from Earth.

The galaxy is relatively dim and has only a small rate of new star formation (https://goo.gl/Mn2Zxf). It has a diffuse spiral structure with a weak bar of stars (hence "barred") at its center.

NGC 4242 was discovered April 10th, 1788, by the English astronomer William Herschel (https://goo.gl/E9YsKH).

More information here:
https://www.spacetelescope.org/images/potw1729a/

Barred Spiral Galaxy

Barred spiral galaxies are spiral galaxies with central bar-shaped structures composed of stars. Our Milky Way Galaxy (https://goo.gl/aklgg) is a barred spiral galaxy. More information here:
https://en.wikipedia.org/wiki/Barred_spiral_galaxy

More on the morphological classification of galaxies:
https://en.wikipedia.org/wiki/Galaxy_morphological_classification

Image credit: NGC 4242 ESA/Hubble & NASA https://goo.gl/b8iWJp CC BY 4.0 https://goo.gl/hNRHCd

Thank you for your interest in this Astronomy/Astrophysics collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Space/Space Technology collection here: https://goo.gl/5KP0wx

#science #astronomy #ngc4242 #spiralgalaxy #barredspiralgalaxy #galaxy #starformation #space #hubble #hst
Photo

Post has attachment
IC 4628 - The Prawn Nebula

In this image, taken by +Dylan O'Donnell from his own Observatory in Byron Bay, Australia, using an 11″ Celestron F2 RASA telescope and a QHY9 mono CCD you can see the Prawn Nebula (IC 4628, Gum 56), an HII region emission nebula, located in the constellation of Scorpius (The Scorpion, https://goo.gl/q4F1eg), about 6,000 light-years away from Earth. It has a diameter of about 250 light-years.

IC 4628 is a massive stellar nursery with lots of ongoing star formation (https://goo.gl/Mn2Zxf) and many young and hot stars ionizing the gas in the nebula with their strong ultraviolet radiation, turning it into an emission nebula.

It is home (https://goo.gl/bezRBQ) to rare O-type stars (https://goo.gl/R0llCW), short-lived blue giants which will end their lives as supernovae (https://goo.gl/VhJNhj) after just a few million years.

I usually go with Dylan's processing of his images, but this time I did some additional processing on the image, mostly to get some more distinction between the red and blue channel. In the end it mostly is a question of personal preference, you can find Dylan's original image here:
https://plus.google.com/u/0/+DylanODonnell/posts/9yuMusyAdGU

More info on the Prawn Nebula as well as an MPG/ESO 2.2-metre telescope image and a VLT Survey Telescope image can be found here:
http://www.eso.org/public/news/eso1535/
http://www.eso.org/public/images/eso1340a/
https://en.wikipedia.org/wiki/Prawn_Nebula

And more images here:
https://apod.nasa.gov/apod/ap160704.html
https://apod.nasa.gov/apod/ap161209.html
https://apod.nasa.gov/apod/ap061020.html

What is an emission nebula?

An emission nebula is a cloud of ionized gas (often by ultraviolet radiation from nearby stars) emitting light of various colors, in case of HII mostly reddish-pink (viewed in natural colors). More information here:
https://en.wikipedia.org/wiki/Emission_nebula
https://en.wikipedia.org/wiki/H_II_region

Read more about the different types of nebulae here in this article I wrote for PhotographingSpace:
https://photographingspace.com/what-are-nebulae/

And in case you want to know more about colors in astrophotography, take a look here:
https://photographingspace.com/ap-color/

Image credit: IC 4628 +Dylan O'Donnell https://goo.gl/WBGFPX with additional processing by +Pierre Markuse

If you like this photograph then you can find more of Dylan's work here at his website http://deography.com/ make sure to also follow him on Twitter https://twitter.com/erfmufn and on Instagram https://www.instagram.com/dylan_odonnell_/

Thank you for your interest in this Astronomy/Astrophysics collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Space/Space Technology collection here: https://goo.gl/5KP0wx

#science #astronomy #ic4628 #gum56 #prawnnebula #hiiregion #starformation #emissionnebula #astrophotography #photography #space 
Photo

Post has attachment
Earth from Space: Wildfires at Mount Vesuvius near Naples, Italy

In this composite image you can see wildfires at Mount Vesuvius near Naples, Italy, imaged by the Multi-Spectral Instrument (MSI) aboard the new Sentinel-2B satellite (https://goo.gl/CXyPUK). The images were taken July 12th, 2017.

Clearly visible is the smoke cloud produced by the fire. NIR/SWIR highlights in yellow and red are showing areas with possible ongoing or recent fires.

You can see and download a full-size version (10 meters/pixel) of this image and additional images here:
https://flic.kr/s/aHsm4k9X2A

The area on Google maps:
https://goo.gl/EH1mtx

Technical Data

For those interested, here the technical data for this image. The image is a MSI Band 4-3-2 (natural color) image with NIR/SWIR highlights to show hotter areas with possible fires. The resulting colors are near natural (except the highlights), contrast is slightly enhanced. Image scale is 23 meters/pixel.

More Images of Earth from Space:

You can find more images of Earth from Space in my latest collection post here (https://goo.gl/pir7pU). Even more images can be found on my Flickr here (https://www.flickr.com/photos/pierre_markuse/).

More on the Copernicus programme aimed at observing the Earth:
http://www.esa.int/Our_Activities/Observing_the_Earth/Copernicus
https://en.wikipedia.org/wiki/Copernicus_Programme

More on the Sentinel-2B satellite:
https://earth.esa.int/web/guest/missions/esa-future-missions/sentinel-2
https://en.wikipedia.org/wiki/Sentinel-2B

Image credit: Wildfires at Mount Vesuvius, Italy Contains modified Copernicus Sentinel data [2017] Sentinel-2B Pre-Operations data, processed by +Pierre Markuse

Thank you for your interest in this Space/Space technology collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Astronomy/Astrophysics collection here: https://goo.gl/x0zPAJ

#science #earth #wildfire #italy #mountvesuvius #naples #napoli #vesuvio #smoke #smokeplume #space #sentinel #sentinel2 #esa #satelliteimages #spacetechnology #photography
Photo

Post has attachment
Earth from Space: Wildfires near Hanceville, British Columbia, Canada

In this composite image you can see wildfires near Hanceville, British Columbia, Canada, imaged by the Multi-Spectral Instrument (MSI) aboard the Sentinel-2A satellite. The images were taken July 8th, 2017.

Clearly visible is the smoke cloud produced by the fire. NIR/SWIR highlights in yellow and red are showing areas with possible ongoing or recent fires.

British Columbia has currently several ongoing wildfires, some of them prompting evacuations (more than 14,000 people already) and causing massive damage. More here:
http://www.bbc.com/news/world-us-canada-40546628

You can see and download a full-size version (10 meters/pixel) of this image and additional images here:
https://flic.kr/s/aHsm4izjG2

The area on Google maps:
https://goo.gl/axggbd

Technical Data

For those interested, here the technical data for this image. The image is a MSI Band 4-3-2 (natural color) image with NIR/SWIR highlights to show hotter areas with possible fires. The resulting colors are near natural (except the highlights), contrast is slightly enhanced. Image scale is 20 meters/pixel.

More Images of Earth from Space:

You can find more images of Earth from Space in my latest collection post here (https://goo.gl/pir7pU). Even more images can be found on my Flickr here (https://www.flickr.com/photos/pierre_markuse/).

More on the Copernicus programme aimed at observing the Earth:
http://www.esa.int/Our_Activities/Observing_the_Earth/Copernicus
https://en.wikipedia.org/wiki/Copernicus_Programme

More on the Sentinel-2A satellite:
https://earth.esa.int/web/guest/missions/esa-future-missions/sentinel-2
https://en.wikipedia.org/wiki/Sentinel-2

Image credit: Wildfires near Hanceville, Canada Contains modified Copernicus Sentinel data [2017], processed by +Pierre Markuse

Thank you for your interest in this Space/Space technology collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Astronomy/Astrophysics collection here: https://goo.gl/x0zPAJ

#science #earth #wildfire #canada #britishcolumbia #smoke #smokeplume #space #sentinel #sentinel2 #esa #satelliteimages #spacetechnology #photography
Photo

Post has attachment
NGC 2500 - Barred Spiral Galaxy

In this image, taken by the Hubble Space Telescope, you can see NGC 2500. It is a barred spiral galaxy, located in the constellation of Lynx (https://goo.gl/A0ysC3), about 30 million light-years away from Earth.

The spiral structure of this barred spiral galaxy (https://goo.gl/d3D1xC) is a little distorted, but still clearly visible. About two thirds of all spiral galaxies are barred spiral galaxies. The galaxy features many regions with ongoing star formation (https://goo.gl/Mn2Zxf), especially in the right half of the image. It is part of the NGC 2841 group (https://goo.gl/zSWEAM) of galaxies.

NGC 2500 was discovered January 19th, 1788, by the English astronomer William Herschel (https://goo.gl/E9YsKH).

More information here:
https://www.spacetelescope.org/images/potw1728a/
https://en.wikipedia.org/wiki/NGC_2500

Barred Spiral Galaxy

Barred spiral galaxies are spiral galaxies with central bar-shaped structures composed of stars. Our Milky Way Galaxy (https://goo.gl/aklgg) is a barred spiral galaxy. More information here:
https://en.wikipedia.org/wiki/Barred_spiral_galaxy

More on the morphological classification of galaxies:
https://en.wikipedia.org/wiki/Galaxy_morphological_classification

Image credit: NGC 2500 ESA/Hubble & NASA https://goo.gl/R73zG9 CC BY 4.0 https://goo.gl/hNRHCd

Thank you for your interest in this Astronomy/Astrophysics collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Space/Space Technology collection here: https://goo.gl/5KP0wx

#science #astronomy #ngc2500 #spiralgalaxy #galaxy #barredspiralgalaxy #hubble #hst #space #starformation #hiinucleus
Photo
Wait while more posts are being loaded