It may look like a paper Moon. Sailing past a canvas Sun. But those are not cardboard clouds. And it's not make believe. The featured picture of an orange colored sky is real -- a digital composite of two exposures of the solar eclipse that occurred earlier this month. The first exposure was taken with a regular telescope that captured an overexposed Sun and an underexposed Moon, while the second image was taken with a solar telescope that captured details of the chromosphere of the background Sun. The Sun's canvas-like texture was brought up by imaging in a very specific shade of red emitted by hydrogen. Several prominences can be seen around the Sun's edge. The image was captured just before sunset from Xilingol, Inner Mongolia, China. It's also not make-believe to imagine that the Moon is made of dense rock, the Sun is made of hot gas, and clouds are made of floating droplets of water and ice.
https://apod.nasa.gov/apod/ap210628.html
Η διασημότερη φωτογραφία γισ το #Εμβολιο της ευλογιάς ήταν το 1901 από τον Dr Allan Warner στο Leicester Isolation Hospital. Ήθελε να δείξει στους σκεπτικιστές τι σημαίνει εμβόλιο. Έδειχνε δύο παιδιά ένα μολυσμένο με τον ιό κ το άλλο εμβολιασμένο.
— Εμπενίζερ Σκρουτζ (@domesticus_pf) July 4, 2021
Το 1980 η ευλογιά ήταν παρελθόν. pic.twitter.com/SWEF3ogBLE
Τα εμβόλια δουλεύουν και μας προστατεύουν.
The @SpaceX #CargoDragon vehicle, seen here approaching the station on June 5, will depart on Tuesday at 11am ET loaded with 5,000 pounds of cargo live on @NASA TV. https://t.co/yuOTrYN8CV pic.twitter.com/2zjmA4C3d2
— International Space Station (@Space_Station) July 4, 2021
Wouldn't it be fun if clouds were castles? Wouldn't it be fun if the laundry on the bedroom chair was a superhero? Wouldn't it be fun if rock mesas on Mars were interplanetary monuments to the human face? Clouds, though, are floating droplets of water and ice. Laundry is cotton, wool, or plastic, woven into garments. Famous Martian rock mesas known by names like the Face on Mars appear quite natural when seen more clearly on better images. Is reality boring? Nobody knows why some clouds make rain. Nobody knows if life ever developed on Mars. Nobody knows why the laundry on the bedroom chair smells like root beer. Scientific exploration can not only resolve mysteries, but uncover new knowledge, greater mysteries, and yet deeper questions. As humanity explores our universe, perhaps fun -- through discovery -- is just beginning.
https://apod.nasa.gov/apod/ap210704.html
Άκυρα τα μνημόνια της Άγκυρας με την Τρίπολη: Κοινό μήνυμα Δένδια και Αγκίλα Σάλεχ https://t.co/SjOyNht2l9
— HellasJournal.Com (@HellasJournal) July 2, 2021
Awash in a sea of incandescent plasma and anchored in strong magnetic fields, sunspots are planet-sized dark islands in the solar photosphere, the bright surface of the Sun. Found in solar active regions, sunspots look dark only because they are slightly cooler though, with temperatures of about 4,000 kelvins compared to 6,000 kelvins for the surrounding solar surface. These sunspots lie in active region AR2835. The largest active region now crossing the Sun, AR2835 is captured in this sharp telescopic close-up from July 1 in a field of view that spans about 150,000 kilometers or over ten Earth diameters. With powerful magnetic fields, solar active regions are often responsible for solar flares and coronal mass ejections, storms which affect space weather near planet Earth.
https://apod.nasa.gov/apod/ap210702.html
The Johnson & Johnson coronavirus vaccine is effective against the Delta variant, even eight months after inoculation — data that should reassure the 11 million Americans who have gotten the shot. https://t.co/kjEdEmbc5B
— NYT Science (@NYTScience) July 2, 2021
Αμετάκλητο απαλλακτικό βούλευμα για τον Σταύρο #Παπασταύρου, έξι χρόνια μετά. Το ελάχιστο που οφείλει ο ΣΥΡΙΖΑ είναι μια συγγνώμη.https://t.co/aMacbZJ98p
— Niki Kerameus (@nkerameus) July 1, 2021
The Delta variant is gaining traction across the world. But vaccines are driving down case numbers in the U.S., and it’s unclear whether the variant will reverse that trend. https://t.co/Lsr4hyuLTy
— NYT Science (@NYTScience) June 25, 2021
How far can you see? The Andromeda Galaxy, 2.5 million light years away, is the most distant object easily seen by the unaided eye. Other denizens of the night sky, like stars, clusters, and nebulae, are typically hundreds to thousands of light-years distant. That's far beyond the Solar System but well within our own Milky Way Galaxy. Also known as M31, the external galaxy poses directly above a chimney in this well-planned deep night skyscape from an old mine in southern Portugal. The image was captured in a single exposure tracking the sky, so the foreground is slightly blurred by the camera's motion while Andromeda itself looms large. The galaxy's brighter central region, normally all that's visible to the naked-eye, can be seen extending to spiral arms with fainter outer reaches spanning over 4 full moons across the sky. Of course in only 5 billion years or so, the stars of Andromeda could span the entire night sky as the Andromeda Galaxy merges with the Milky Way.
https://apod.nasa.gov/apod/ap210625.html
Few cosmic vistas excite the imagination like the Orion Nebula. Also known as M42, the nebula's glowing gas surrounds hot young stars at the edge of an immense interstellar molecular cloud only 1,500 light-years away. The Orion Nebula offers one of the best opportunities to study how stars are born partly because it is the nearest large star-forming region, but also because the nebula's energetic stars have blown away obscuring gas and dust clouds that would otherwise block our view - providing an intimate look at a range of ongoing stages of starbirth and evolution. The featured image of the Orion Nebula is among the sharpest ever, constructed using data from the Hubble Space Telescope. The entire Orion Nebula spans about 40 light years and is located in the same spiral arm of our Galaxy as the Sun.
https://apod.nasa.gov/apod/ap210629.html
