Astronomy Pic of the Day!


Astronomy Picture of the Day



AE Aurigae and the Flaming Star Nebula 
Image Credit & Copyright: Martin Pugh

Explanation: Why is AE Aurigae called the flaming star? For one reason, the surrounding nebula IC 405 is named the Flaming Star Nebula because the region seems to harbor smoke, even though nothing is on fire, including interior star AE Aurigae. Fire, typically defined as the rapid molecular acquisition of oxygen, happens only when sufficient oxygen is present and is not important in such high-energy, low-oxygen environments. The material that appears as smoke is mostly interstellar hydrogen, but does contain smoke-like dark filaments of carbon-rich dust grains. The bright star AE Aurigae is visible near the nebula center and is so hot it is blue, emitting light so energetic it knocks electrons away from atoms in the surrounding gas. When an atom recaptures an electron, light is emitted creating the surrounding emission nebula. The Flaming Star nebula lies about 1,500 light years distant, spans about 5 light years, and is visible with a small telescope toward the constellation ofthe Charioteer (Auriga).



Blue Comet in the Hyades 
Image Credit & CopyrightRogelio Bernal Andreo (Deep Sky Colors)

Explanation: Stars of the Hyades cluster are scattered through this mosaic spanning over 5 degrees on the sky toward the constellation Taurus. Presently cruising through the Solar System, the remarkably blue cometC/2016 R2 PanSTARRS is placed in the wide field of view using image data from January 12. With the apex of the V-shape in the Hyades cluster positioned near the top center, bright Aldebaran, alpha star of Taurus, anchors the frame at the lower right. A cool red giant, Aldebaran is seen in orange hues in the colorful starfield. While the stars of the Hyades are gathered 151 light-years away, Aldebaran lies only 65 light-years distant and so is separate from the cluster stars. On January 12, C/2016 R2 was over 17 light-minutes from planet Earth and nearly 24 light-minutes from the Sun. Its blue tinted tail largely due to CO+ gas fluorescing in sunlight, the head or coma of the comet appears with a slightly greenish hue, likely emission from diatomic carbon.



An Elephant’s Trunk in Cepheus 
Image Credit & CopyrightProcessing – Robert GendlerRoberto Colombari
Data – Subaru Telescope (NAOJ), Robert Gendler, Adam Block

Explanation: With image data from telescopes large and small, this close-up features the dusty Elephant’s Trunk Nebula. It winds through the emission nebula and young star cluster complex IC 1396, in the high and far off constellation of Cepheus. Also known as vdB 142, the cosmic elephant’s trunk is over 20 light-years long. The colorful view highlights bright, swept-back ridges that outline the region’s pockets of cool interstellar dust and gas. Such embedded, dark, tendril-shaped clouds contain the raw material for star formation and hide protostars within. Nearly 3,000 light-years distant, the relatively faint IC 1396 complex covers a large region on the sky, spanning over 5 degrees. This dramatic scene spans a 1 degree wide field, about the size of 2 Full Moons.


M1: The Incredible Expanding Crab 
Image Credit & CopyrightDetlef Hartmann

Explanation: The Crab Nebula is cataloged as M1, the first on Charles Messier’s famous list of things which are not comets. In fact, the Crab is now known to be a supernova remnant, an expanding cloud of debris from the explosion of a massive star. The violent birth of the Crab was witnessed by astronomers in the year 1054. Roughly 10 light-years across today, the nebula is still expanding at a rate of over 1,000 kilometers per second. Over the past decade, its expansion has been documented in this stunning time-lapse movie. In each year from 2008 to 2017, an image was produced with the same telescope and camera from a remote observatory in Austria. Combined in the time-lapse movie, the 10 images represent 32 hours of total integration time. The sharp, processed frames even reveal the dynamic energetic emission within the incredible expanding Crab. The Crab Nebula lies about 6,500 light-years away in the constellation Taurus.



The Helix Nebula from CFHT 
Image Credit: CFHTCoelumMegaCamJ.-C. Cuillandre (CFHT) & G. A. Anselmi (Coelum)

Explanation: Will our Sun look like this one day? The Helix Nebula is one of brightest and closest examples of a planetary nebula, a gas cloud created at the end of the life of a Sun-like star. The outer gasses of the starexpelled into space appear from our vantage point as if we are looking down a helix. The remnant central stellar core, destined to become a white dwarf star, glows in light so energetic it causes the previously expelled gas to fluoresce. The Helix Nebula, given a technical designation of NGC 7293, lies about 700 light-years away towards the constellation of the Water Bearer (Aquarius) and spans about 2.5 light-years. The featured picturewas taken with the Canada-France-Hawaii Telescope (CFHT) located atop a dormant volcano in HawaiiUSA. A close-up of the inner edge of the Helix Nebula shows complex gas knots of unknown origin.



Unexpected X-Rays from Perseus Galaxy Cluster 
Image Credit: X-ray: NASA/CXO/Oxford University/J. Conlon et al.; Radio: NRAO/AUI/NSF/Univ. of Montreal/Gendron-Marsolais et al.; Optical: NASA/ESA/IoA/A. Fabian et al.; DSS

Explanation: Why does the Perseus galaxy cluster shine so strangely in one specific color of X-rays? No one is sure, but a much-debated hypothesis holds that these X-rays are a clue to the long-sought identity of dark matter. At the center of this mystery is a 3.5 Kilo-electronvolt (KeV) X-ray color that appears to glow excessively only when regions well outside the cluster center are observed, whereas the area directly surrounding a likely central supermassive black hole is actually deficient in 3.5 keV X-rays. One proposed resolution — quite controversial — is that something never seen before might be present: fluorescent dark matter (FDM). This form of particle dark matter might be able to absorb 3.5 keV X-radiation. If operating, FDM, after absorption, might later emit these X-rays from all over the cluster, creating an emission line. However, when seensuperposed in front of the central region surrounding the black hole, FDM’s absorption would be more prominent, creating an absorption linePictured, a composite image of the Perseus galaxy cluster shows visible and radio light in red, and X-ray light from the Earth-orbiting Chandra Observatory in blue.


Sun Halo over Sweden 
Video Credit & Copyright: Håkan Hammar (Vemdalen Ski ResortSkiStar)

Explanation: What’s happened to the Sun? Sometimes it looks like the Sun is being viewed through a giant lens. In the featured video, however, there are actually millions of tiny lenses: ice crystals. Water may freeze in the atmosphere into small, flat, six-sided, ice crystals. As these crystals flutter to the ground, much time is spent with their faces flat and parallel to the ground. An observer may find themselves in the same plane as many of the falling ice crystals near sunrise or sunset. During this alignment, each crystal can act like a miniature lens, refracting sunlight into our view and creating phenomena like parhelia, the technical term for sundogs. Thefeatured video was taken a month ago on the side of a ski hill at the Vemdalen Ski Resort in central Sweden. Visible in the center is the most direct image of the Sun, while two bright sundogs glow prominently from both the left and the right. Also visible is the bright 22 degree halo — as well as the rarer and much fainter 46 degree halo — also created by sunlight reflecting off of atmospheric ice crystals.



Grand Spiral Galaxy NGC 1232 
Image Credit: FORS8.2-meter VLT AntuESO

Explanation: Galaxies are fascinating not only for what is visible, but for what is invisible. Grand spiral galaxy NGC 1232captured in detail by one of the Very Large Telescopes, is a good example. The visible is dominated by millions of bright stars and dark dust, caught up in a gravitational swirl of spiral arms revolving about the center. Open clusters containing bright blue stars can be seen sprinkled along these spiral arms, while dark lanes of dense interstellar dust can be seen sprinkled between them. Less visible, but detectable, are billions of dim normal stars and vast tracts of interstellar gas, together wielding such high mass that they dominate the dynamics of the inner galaxy. Leading theories indicate that even greater amounts of matter are invisible, in a form we don’t yet know. This pervasive dark matter is postulated, in part, to explain the motions of the visible matter in the outer regions of galaxies.




The Spiral North Pole of Mars 
Image Credit: ESA/DLR/FU BerlinNASA MGS MOLA Science Team

Explanation: Why is there a spiral around the North Pole of Mars? Each winter this pole develops a new outer layer about one meter thick composed of carbon dioxide frozen out of the thin Martian atmosphere. This fresh layer is deposited on a water-ice layer that exists year round. Strong winds blow down from above the cap’s center and swirl due to the spin of the red planet — contributing to Planum Boreum‘s spiral structure. The featured image is a perspective mosaic generated earlier this year from numerous images taken by ESA’s Mars Express and elevations extracted from the laser altimeter aboard NASA’s Mars Global Surveyor mission. New missions to Mars planned in the next few years include Insight with plans to drill into Mars, and ExoMars and the Mars 2020 Rover with plans to search for signs of microscopic Martian life — past and present.



The Kepler-90 Planetary System 
Illustration Credit: NASA Ames, Wendy Stenzel

Explanation: Do other stars have planetary systems like our own? Yes — one such system is Kepler-90. Cataloged by the orbiting Kepler satellite, an eighth planet has now been discovered giving Kepler-90 the same number of known planets as our Solar System. Similarities between Kepler-90 and our system include a G-type star comparable to our Sun, rocky planets comparable to our Earth, and large planets comparable in size to Jupiter and Saturn. Differences include that all of the known Kepler-90 planets orbit relatively close in — closer than Earth’s orbit around the Sun — making them possibly too hot to harbor life. However, observations over longer time periods may discover cooler planets further out. Kepler-90 lies about 2,500 light years away, and at magnitude 14 is visible with a medium-sized telescope toward the constellation of the Dragon (Draco). Exoplanet-finding missions planned for launch in the next decade include TESSJWSTWFIRST, and PLATO.


moonshorty_apollo17_1080Apollo 17 at Shorty Crater 
Image Credit: Apollo 17 Crew, NASA

Explanation: In December of 1972, Apollo 17 astronauts Eugene Cernan and Harrison Schmitt spent about 75 hours on the Moon in the Taurus-Littrow valley, while colleague Ronald Evans orbited overhead. This sharp image was taken by Cernan as he and Schmitt roamed the valley floor. The image shows Schmitt on the left with the lunar rover at the edge of Shorty Crater, near the spot where geologist Schmitt discovered orange lunar soil. The Apollo 17 crew returned with 110 kilograms of rock and soil samples, more than was returned from any of the other lunar landing sites. Forty five years later, Cernan and Schmitt are still the lastto walk on the Moon.


Selfie_Curiosity_960Curiosity Rover Takes Selfie on Mars 
Image Credit: NASAJPL-CaltechMSSS

Explanation: Yes, but have you ever taken a selfie on Mars? The Curiosity rover on Mars has. This selfie was compiled from many smaller images — which is why the mechanical arm holding the camera is not visible. (Although its shadow is!) Taken in mid-2015, the featured image shows not only the adventurous rover, but dark layered rocks, the light colored peak of Mount Sharp, and the rusting red sand that pervades Mars. If you look closely, you can even see that a small rock is stuck into one of Curiosity’s aging wheels. Now nearing the end of 2017, Curiosity continues to explore the layers of sedimentary rocks it has discovered on Vera Rubin Ridge in order to better understand, generally, the ancient geologic history of Mars and, specifically, why these types of rocks exist there.


The Comet and the Star Cluster


Image Credit & Copyright: José J. Chambó (Cometografia)

Explanation: Comet Linear has become unexpectedly bright. The comet, discovered in 2000, underwent a 100-fold outburst just a week before it passed a mere 14 lunar distances from Earth late last month. The comet was captured here last week at about magnitude 6 — just bright enough to be seen by the unaided eye — passing in front of the distant globular star clusterM14. Comet 252/P LINEAR is one of a rare group of comets that vacillate between the Earth and Jupiter every 5 years. How the comet will evolve from here is unknown, but hopes run high that it will remain a good object for binoculars in northern skies for the next week or two.


A Green Flash of Spring


Image Credit & Copyright: Murray Schukar

Explanation: Taken on March 20 from the top of Haleakala on the isle of Maui, planet Earth, the first sunrise of northern spring is pictured in this vacation snapshot. The telephoto view from the volcanic caldera above a sea of clouds also captures an elusive green flash near the Sun’s upper limb. Atmospheric layers with sharp temperature changes cause the colorful flash as the Sun rises behind a distant cloud bank. Refraction along sight lines through the layers creates multiple distorted images of the Sun, and for a moment, can visibly deflect shorter wavelength green light.


Space Exporation: Titan’s Hydrocarbon Lakes


Imagine being submersed in a lake of liquid methane.

If you’re still reading then obviously you’re curious. Scientists may be close to sending a floating probe to the lakes of hydrocarbons on Titan’s surface. One small, but important constituent in the moon’s atmosphere and on the surface, is methane. Methane gas is not uncommon on earth, ask my old roommate. But conditions for liquid methane are down right bizarre compared to any known conditions here on earth.

Saturn’s largest moon, Titan is a world of mostly nitrogen and small amounts of methane in its atmosphere, not too dissimilar to earth. A satellite image of Titan in the visible wavelengths, however, is just a beautiful homogenous yellow haze. So we must probe the small world with infrared light, longer than our visible red light, to observe the surface features.


Even more fascinating, Titan has a precipitation cycle just as Earth has the water cycle. Methane can exist in two of the three phases on Titan, liquid and vapor, but researchers have recently come across data that might suggest hydrocarbon (methane and ethane) ice as well. That’s pretty spectacular if you ask me.


A joint mission of NASA and ESA, the Cassini satellite deployed the Huygens probe which descended through the atmosphere of Titan and settled on the surface before losing contact. All through its journey, the probe was able to not only take and transmit vital atmospheric and chemical data, but also images.

One of the largest topics in space exploration is for life, understandably so. Aside from ethical dilemmas, exploring Jupiter’s moon Europa might be a better target than Titan. Europa has liquid and solid water, why not focus on this world instead? For one, an international team of experts could not fully agree 100% on a way to probe Europa without contaminating potential life. So in the mean time, maybe we can explore somewhere that have conditions extreme enough to handle our potential contamination, but also have environments that are similar to when life on earth was prebiotic. Mmmm, how about Titan?

Christophe Sotin of the Jet Propulsion Lab,”Dynamic, methane-driven photochemistry at Titan produces prebiotic molecules similar to those that must have existed on an early Earth. Though it may be shorter-lived than previously believed, details about Titan’s methane cycle provide a glimpse into the kinds of conditions that existed on our planet before life evolved.”

Which brings us back to submerging in liquid methane/ethane. The two main objectives I can propose from these articles are: this could be a very good step towards the approach of Europa and this could broaden our concept of our own origins as well as any potential new forms.

Jeremy Hsu,”a Titan mission may also prove less technically challenging than the unprecedented step of putting landers or submersible drones on Jupiter’s icy moon of Europa.”

Chemist Dr. Chao He on the environments on Titan,”The study of organic chemistry on Titan’s surface would extend our understanding of the diversity of prebiotic chemistry, and perhaps life’s origin on Earth.”

If we plan on trying to figure out life, any type of life, knowing the origins of ours is vital since it’s the only concrete form we know. And finding conditions similar to any stage of life on earth in present day surroundings, well that’s plain fascinating.

One thing that seemed to be void in all the articles was budget justification for a layperson. Unfortunately our world has numerous issues that are of extreme importance in which this money could possibly help. Even as an undergrad who is just interested in this topic, I have been asked numerous times, “Why are we focusing so much time and resources into exploring space?” “Don’t you think there are more important issues at hand on earth?”

No answer I have been able to give, no matter how relevant to me, seems to fully drive a convincing answer to the questioner. As an aspiring scientist, I almost never think about having to justify any exploration, but I haven’t dealt with the real world yet either, I guess.

In addition, the work that I am doing with Titan seems to follow the overall topic in two of these papers: decreasing methane and the original source of methane. The later could be a by-product of living organisms. The work of Eliot Young of Southwest Research Institute is the Principal Investigator for a project that aims to accurately determine if there are any current or near-past sources of methane on Titan. The report by Sotin appears, without a doubt, to ensure methane is on its way out on Titan.

Eliot Young, “Our observing program has been designed to address two ongoing questions: what is the composition of various surface units on Titan (including lakes, dunes, etc.) and is there a discernible source of atmospheric methane?”
NASA KECK 2013A PROPOSAL #80 Coordinated Image Cubes of Titan during the T90 Cassini Flyby

Life on Titan:

Pictures from Huygens lander:
Cassini Science League

A new hope for us extreme motion sick people


Remember all those fun roller coasters you rode as a kid? Pretty mind-blowing and intense. How about the classic spinning tea cups? Also fun, eh? Well, not in my eyes. All those spinny rides that plaster your brain to the walls of your skull are no friend of mine. Unfortunately, even things like reading on the bus or in the car are lumped into the disasters listed above. I have an extra bad tolerance to motion and it takes a decent amount of work to avoid/combat it for me.

As someone who is haunted and miserable from any form of motion sickness, I found an article that might give a person like me a whole new world of hope. In an article entitled A devide (device) to zap away motion sickness, author Matthew Stock has…

The research has been conducted by clinical scientist Dr. Qadeer Arshad has tackled the problem head on; yes, pun intended. At the Imperial College London, Dr. Arshad collaborated with Professor Michael Gresty published an article in the journal Neurology probing the connection between motion sickness and the confusion between what the eyes see and the inner ears feel. An expert on motion sickness, Gresty points out it is the confusion between the eyes and the inner ears in the brain leads to the feeling of nausea.

The theory is to send mild electric currents to the brain through the scalp to suppress the signals to the brain from the inner ear in hopes of avoiding the confusion.

In the experiment, test subjects were placed in a rotating seat that tilts and their susceptibilities were recorded, the subjects were fitted with the electrodes and spent another round in the seat. After 10 minutes the subjects found that their were less nauseous and recovered faster than the test trial.