NASA

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2020-03-25 11:27:01 #NewImage from #Nasa: "Star Forming Region S106 " Massive star IRS 4 is beginning to spread its wings. Born only about 100,000 years ago, material streaming out from this newborn star has formed the nebula dubbed Sharpless 2-106 Nebula (S106), featured here. A large disk of dust and gas orbiting Infrared Source 4 (IRS 4), visible in brown near the image center, gives the nebula an hourglass or butterfly shape. S106 gas near IRS 4 acts as an emission nebula as it emits light after being ionized, while dust far from IRS 4 reflects light from the central star and so acts as a reflection nebula. Detailed inspection of a relevant infrared image of S106 reveal hundreds of low-mass brown dwarf stars lurking in the nebula's gas. S106 spans about 2 light-years and lies about 2000 light-years away toward the constellation of the Swan (Cygnus). [March 25, 2020] https://apod.nasa.gov/image/2003/S106_Mishra_960.jpg Open / Comment

2020-03-19 00:18:15 #BreakingNews from #Nasa: "NASA Administrator Statement on Apollo Astronaut Al Worden" NASA sends its condolences to the family and loved ones of Apollo astronaut Al Worden, an astronaut whose achievements in space and on Earth will not be forgotten. [March 18, 2020] Read more here: http://www.nasa.gov/press-release/nasa-administrator-statement-on-apollo-astronaut-al-worden Open / Comment

2020-03-05 20:20:49 #NewPhoto from #Nasa: "Artemis I's Orion Capsule Undergoing Testing" NASA’s Orion spacecraft, a critical part of the agency’s Artemis I mission, is nearing the end of a three-month testing campaign at the agency's Plum Brook Station. [March 04, 2020] http://www.nasa.gov/sites/default/files/thumbnails/image/orion_5.jpg Open / Comment

2020-02-26 21:01:09 #NewImage from #Nasa: "Moon Corona, Halo, and Arcs over Manitoba " Yes, but could you get to work on time if the Moon looked like this? As the photographer was preparing to drive to work, refraction, reflection, and even diffraction of moonlight from millions of falling ice crystals turned the familiar icon of our Moon into a menagerie of other-worldly halos and arcs. The featured scene was captured with three combined exposures two weeks ago on a cold winter morning in Manitoba, Canada. The colorful rings are a corona caused by quantum diffraction by small drops of water or ice near the direction of the Moon. Outside of that, a 22-degree halo was created by moonlight refracting through six-sided cylindrical ice crystals. To the sides are moon dogs, caused by light refracting through thin, flat, six-sided ice platelets as they flittered toward the ground. Visible at the top and bottom of the 22-degree halo are upper and lower tangent arcs, created by moonlight refracting through nearly horizontal hexagonal ice cylinders. A few minutes later, from a field just off the road to work, the halo and arcs had disappeared, the sky had returned to normal -- with the exception of a single faint moon dog. [February 24, 2020] https://apod.nasa.gov/image/2002/MoonHalo_Mckean_960.jpg Open / Comment

2020-02-17 13:58:06 #NewImage from #Nasa: "The Changing Surface of Fading Betelgeuse " Besides fading, is Betelgeuse changing its appearance? Yes. The famous red supergiant star in the familiar constellation of Orion is so large that telescopes on Earth can actually resolve its surface -- although just barely. The two featured images taken with the European Southern Observatory's Very Large Telescope show how the star's surface appeared during the beginning and end of last year. The earlier image shows Betelgeuse having a much more uniform brightness than the later one, while the lower half of Betelgeuse became significantly dimmer than the top. Now during the first five months of 2019 amateur observations show Betelgeuse actually got slightly brighter, while in the last five months the star dimmed dramatically. Such variability is likely just normal behavior for this famously variable supergiant, but the recent dimming has rekindled discussion on how long it may be before Betelgeuse does go supernova. Since Betelgeuse is about 700 light years away, its eventual supernova -- probably thousands of years in the future -- will likely be an amazing night-sky spectacle, but will not endanger life on Earth. [February 17, 2020] https://apod.nasa.gov/image/2002/Betelgeuse2019_ESO_1080.jpg Open / Comment

2020-01-21 09:44:53 #NewImage from #Nasa: "Quadrantid Meteors through Orion " Why are these meteor trails nearly parallel? Because they were all shed by the same space rock and so can be traced back to the same direction on the sky: the radiant of the Quadrantid Meteor Shower. This direction used to be toward the old constellation of Quadrans Muralis, hence the name Quadrantids, but when the International Astronomical Union formulated its list of modern constellations in 1922, this constellation did not make the list. Even though the meteors are now considered to originate from the recognized constellation of Bootes, the old name stuck. Regardless of the designation, every January the Earth moves through a dust stream and bits of this dust glow as meteors as they heat up in Earth's atmosphere. The featured image composite was taken on January 4 with a picturesque snowy Slovakian landscape in the foreground, and a deep-exposure sky prominently featuring the constellation Orion in the background. The red star Betelgeuse appears unusually dim -- its fading over the past few months is being tracked by astronomers. [January 20, 2020] https://apod.nasa.gov/image/2001/QuadrantidsOrion_Horalek_960.jpg Open / Comment

2020-01-19 10:22:36 #NewImage from #Nasa: "M1: The Incredible Expanding Crab Nebula " Are your eyes good enough to see the Crab Nebula expand? 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. [January 19, 2020] https://img.youtube.com/vi/qL1f40NPG8w/maxresdefault.jpg Open / Comment

2020-01-18 10:05:05 #NewImage from #Nasa: "An Almost Eclipse of the Moon" This composited series of images follows the Moon on January 10, the first Full Moon of 2020, in Hungarian skies. The lunar disk is in mid-eclipse at the center of the sequence though. It looks only slightly darker there as it passes through the light outer shadow or penumbra of planet Earth. In fact during this penumbral lunar eclipse the Moon almost crossed into the northern edge of Earth's dark central shadow or umbra. Subtle and hard to see, this penumbral lunar eclipse was the first of four lunar eclipses in 2020, all of which will be penumbral lunar eclipses. [January 18, 2020] https://apod.nasa.gov/image/2001/APOD-Soponyai-PenumbralEclipse1067.jpg Open / Comment