Wow,very exciting! Congratulations to Einstein@home! The Astrophysical Journal presents 13 of 17 newly discovered pulsars found with the distributed computing project.
“Einstein@Home searched through 118 unidentified pulsar-like sources from the Fermi-LAT Catalog,” says Prof. Dr. Bruce Allen, director of Einstein@Home and director at the Max Planck Institute for Gravitational Physics in Hanover. “Colin has shown that 17 of these are indeed pulsars, and I would bet that many of the remaining 101 are also pulsars, but in binary systems, where we lack sensitivity. In the future, using improved methods, Einstein@Home is going to chase after those as well, and I am optimistic that we will find at least some of them.”
We need more missions like Cassini going to other as yet unexplored planets. Have a look at our Mimas page
The original caption:
Shadows cast across Mimas’ defining feature, Herschel Crater, provide an indication of the size of the crater’s towering walls and central peak.
Named after the icy moon’s discoverer, astronomer William Herschel, the crater stretches 86 miles (139 kilometers) wide — almost one-third of the diameter of Mimas (246 miles or 396 kilometers) itself.
Large impact craters often have peaks in their center — see Tethys’ large crater Odysseus in PIA08400. Herschel’s peak stands nearly as tall as Mount Everest on Earth.
This view looks toward the anti-Saturn hemisphere of Mimas. North on Mimas is up and rotated 21 degrees to the left. The image was taken with the Cassini spacecraft narrow-angle camera on Oct. 22, 2016 using a combination of spectral filters which preferentially admits wavelengths of ultraviolet light centered at 338 nanometers.
The view was acquired at a distance of approximately 115,000 miles (185,000 kilometers) from Mimas and at a Sun-Mimas-spacecraft, or phase, angle of 20 degrees. Image scale is 3,300 feet (1 kilometer) per pixel.
The galaxy above called IC-3639 has an Active Galactic Nucleus that is actually obscured which leads to even more questions. AGN’s are super-massive black holes (in the order of a million to probably hundreds of million solar masses) that are accreting massive amounts of matter, which is to say “feeding”. The accretion disc makes the Active Galaxies among the brightest objects in terms of electromagnetic radiation, so bright it is not often whether or not a galaxy is active, is in question, IC 3639 is such a galaxy.
A word about black holes in general because some people have a mistaken impression of black holes as marauding monsters roaming the universe looking for innocent planets to swallow up, that just came up on an outing with friends. No, a black holes don’t really do that. In fact if you took a black hole of one-solar-mass and swapped it with our Sun our solar system would just keep right on going just like it does now, aside from light and heat of course, the fabric of space-time would be just as it is now.
IC 3639, a galaxy with an active galactic nucleus, is seen in this image combining data from the Hubble Space Telescope and the European Southern Observatory.
This galaxy contains an example of a supermassive black hole hidden by gas and dust. Researchers analyzed NuSTAR data from this object and compared them with previous observations from NASA’s Chandra X-Ray Observatory and the Japanese-led Suzaku satellite. The findings from NuSTAR, which is more sensitive to higher energy X-rays than these observatories, confirm the nature of IC 3639 as an active galactic nucleus that is heavily obscured, and intrinsically much brighter than observed.
NuSTAR is a Small Explorer mission led by Caltech and managed by JPL for NASA’s Science Mission Directorate in Washington. NuSTAR was developed in partnership with the Danish Technical University and the Italian Space Agency (ASI). The spacecraft was built by Orbital Sciences Corp., Dulles, Virginia. NuSTAR’s mission operations center is at UC Berkeley, and the official data archive is at NASA’s High Energy Astrophysics Science Archive Research Center. ASI provides the mission’s ground station and a mirror archive. JPL is managed by Caltech for NASA.
A beautiful sight and one that could be seen by humans in the not too distant future. This image was taken from the Mars Reconnaissance Orbiter and took a bit of processing, however I suspect at some point in a voyage to Mars the travelers would see this very sight.
I wonder if looking back at this from a craft heading to Mars, if second thoughts come to mind.
About the image from NASA
This composite image of Earth and its moon, as seen from Mars, combines the best Earth image with the best moon image from four sets of images acquired on Nov. 20, 2016, by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter.
Each was separately processed prior to combining them so that the moon is bright enough to see. The moon is much darker than Earth and would barely be visible at the same brightness scale as Earth. The combined view retains the correct sizes and positions of the two bodies relative to each other.
HiRISE takes images in three wavelength bands: infrared, red, and blue-green. These are displayed here as red, green, and blue, respectively. This is similar to Landsat images in which vegetation appears red. The reddish feature in the middle of the Earth image is Australia. Southeast Asia appears as the reddish area (due to vegetation) near the top; Antarctica is the bright blob at bottom-left. Other bright areas are clouds.
These images were acquired for calibration of HiRISE data, since the spectral reflectance of the Moon’s near side is very well known. When the component images were taken, Mars was about 127 million miles (205 million kilometers) from Earth. A previous HiRISE image of Earth and the moon is online at PIA10244.
Credit: NASA/JPL-Caltech/Univ. of Arizona
Edit: the could – well debacle was fixed, tried to get “fancy” – fail lol.
Many people believe that the December solstice marks the point were the Earth’s orbit takes it closest to the sun. It turns out the tilt of the Earth (and what determines day length) and where it is in orbit do not quite coincide.
Today at 14:18 UTC the Earth reaches perihelion, the closest we get to the Sun in our orbit.
Sunlight truly has come to Saturn’s north pole. The whole northern region is bathed in sunlight in this view from late 2016, feeble though the light may be at Saturn’s distant domain in the solar system.
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. Mission experts on Saturn’s atmosphere are taking advantage of the season and Cassini’s favorable viewing geometry to study this and other weather patterns as Saturn’s northern hemisphere approaches Summer solstice.
This view looks toward the sunlit side of the rings from about 51 degrees above the ring plane. The image was taken with the Cassini spacecraft wide-angle camera on Sept. 9, 2016 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 728 nanometers.
The view was obtained at a distance of approximately 750,000 miles (1.2 million kilometers) from Saturn. Image scale is 46 miles (74 kilometers) per pixel.