Hey, guys! So I’m not dead but I am over @quimulti. Spock will be soon joining the collective over there (at the url greenearedhobgoblin) so just wanted to drop by and let you know what’s going on.
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Hey, guys! So I’m not dead but I am over @quimulti. Spock will be soon joining the collective over there (at the url greenearedhobgoblin) so just wanted to drop by and let you know what’s going on.
Five Famous Pulsars from the Past 50 Years
Early astronomers faced an obstacle: their technology. These great minds only had access to telescopes that revealed celestial bodies shining in visible light. Later, with the development of new detectors, scientists opened their eyes to other types of light like radio waves and X-rays. They realized cosmic objects look very different when viewed in these additional wavelengths. Pulsars — rapidly spinning stellar corpses that appear to pulse at us — are a perfect example.
The first pulsar was observed 50 years ago on August 6, 1967, using radio waves, but since then we have studied them in nearly all wavelengths of light, including X-rays and gamma rays.
Typical Pulsar
Most pulsars form when a star — between 8 and 20 times the mass of our sun — runs out of fuel and its core collapses into a super dense and compact object: a neutron star.
These neutron stars are about the size of a city and can rotate slowly or quite quickly, spinning anywhere from once every few hours to hundreds of times per second. As they whirl, they emit beams of light that appear to blink at us from space.
First Pulsar
One day five decades ago, a graduate student at the University of Cambridge, England, named Jocelyn Bell was poring over the data from her radio telescope - 120 meters of paper recordings.
Image Credit: Sumit Sijher
She noticed some unusual markings, which she called “scruff,” indicating a mysterious object (simulated above) that flashed without fail every 1.33730 seconds. This was the very first pulsar discovered, known today as PSR B1919+21.
Best Known Pulsar
Before long, we realized pulsars were far more complicated than first meets the eye — they produce many kinds of light, not only radio waves. Take our galaxy’s Crab Nebula, just 6,500 light years away and somewhat of a local celebrity. It formed after a supernova explosion, which crushed the parent star’s core into a neutron star.
The resulting pulsar, nestled inside the nebula that resulted from the supernova explosion, is among the most well-studied objects in our cosmos. It’s pictured above in X-ray light, but it shines across almost the entire electromagnetic spectrum, from radio waves to gamma rays.
Brightest Gamma-ray Pulsar
Speaking of gamma rays, in 2015 our Fermi Gamma-ray Space Telescope discovered the first pulsar beyond our own galaxy capable of producing such high-energy emissions.
Located in the Tarantula Nebula 163,000 light-years away, PSR J0540-6919 gleams nearly 20 times brighter in gamma-rays than the pulsar embedded in the Crab Nebula.
Dual Personality Pulsar
No two pulsars are exactly alike, and in 2013 an especially fast-spinning one had an identity crisis. A fleet of orbiting X-ray telescopes, including our Swift and Chandra observatories, caught IGR J18245-2452 as it alternated between generating X-rays and radio waves.
Scientists suspect these radical changes could be due to the rise and fall of gas streaming onto the pulsar from its companion star.
Transformer Pulsar
This just goes to show that pulsars are easily influenced by their surroundings. That same year, our Fermi Gamma Ray Space Telescope uncovered another pulsar, PSR J1023+0038, in the act of a major transformation — also under the influence of its nearby companion star.
The radio beacon disappeared and the pulsar brightened fivefold in gamma rays, as if someone had flipped a switch to increase the energy of the system.
NICER Mission
Our Neutron star Interior Composition Explorer (NICER) mission, launched this past June, will study pulsars like those above using X-ray measurements.
With NICER’s help, scientists will be able to gaze even deeper into the cores of these dense and mysterious entities.
For more information about NICER, visit https://www.nasa.gov/nicer
Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com
A Piece of the Action would have been so much sexier if McCoy was also wearing a suit :)
True.
Ask and you shall receive! ♥
doodled T’Pring (the Captain of SS Narak’es, a geneticist, and all in all a cool person) from out of obscurity fic
fight me
Captain’s Log Stardate: fuck this shit man theyh fuckied up my chickernb snadnwich i am so rfucukcing angary right now fcku
Young Spock and I-Chaya. Watched all the old ST movies last night and now I’d really like to sleep.
i really looooove science. i love the scientific method. i love the mindset science invokes. weird ass chemistry biophysics and neuroscience and giant gaseous clouds in the universe and fricken volcanoes. just the fact that we know all we know. w o w
Spock, probably while talking to a new ensign who also loves science
AU!Star Trek
Spock- captain, jim- first officer
bravemccoy:
random edit 35/?
it works best if you imagine her standing atop a mountain of corpses instead of the nondescript rock formation but I was too lazy to draw that
learning is the most important part of life. never stop learning. never abandon curiosity
Give Spock a lab coat 2k17