Hubble Spots Flock Of Cosmic Ducks By NASA Goddard Photo And Video

Ultra-Close Orbits of Saturn = Ultra-Cool Science

On Sept. 15, 2017, our Cassini spacecraft ended its epic exploration of Saturn with a planned dive into the planet’s atmosphere–sending back new science to the very last second. The spacecraft is gone, but the science continues!

New research emerging from the final orbits represents a huge leap forward in our understanding of the Saturn system – especially the mysterious, never-before-explored region between the planet and its rings. Some preconceived ideas are turning out to be wrong while new questions are being raised. How did they form? What holds them in place? What are they made of?

Six teams of researchers are publishing their work Oct. 5 in the journal Science, based on findings from Cassini’s Grand Finale. That’s when, as the spacecraft was running out of fuel, the mission team steered Cassini spectacularly close to Saturn in 22 orbits before deliberately vaporizing it in a final plunge into the atmosphere in September 2017.

Knowing Cassini’s days were numbered, its mission team went for gold. The spacecraft flew where it was never designed to fly. For the first time, it probed Saturn’s magnetized environment, flew through icy, rocky ring particles and sniffed the atmosphere in the 1,200-mile-wide (2,000-kilometer-wide) gap between the rings and the cloud tops. Not only did the engineering push the spacecraft to its limits, the new findings illustrate how powerful and agile the instruments were.

Many more Grand Finale science results are to come, but today’s highlights include:

Complex organic compounds embedded in water nanograins rain down from Saturn’s rings into its upper atmosphere. Scientists saw water and silicates, but they were surprised to see also methane, ammonia, carbon monoxide, nitrogen and carbon dioxide. The composition of organics is different from that found on moon Enceladus – and also different from those on moon Titan, meaning there are at least three distinct reservoirs of organic molecules in the Saturn system.

For the first time, Cassini saw up close how rings interact with the planet and observed inner-ring particles and gases falling directly into the atmosphere. Some particles take on electric charges and spiral along magnetic-field lines, falling into Saturn at higher latitudes – a phenomenon known as “ring rain.” But scientists were surprised to see that others are dragged quickly into Saturn at the equator. And it’s all falling out of the rings faster than scientists thought – as much as 10,000 kg of material per second.

Scientists were surprised to see what the material looks like in the gap between the rings and Saturn’s atmosphere. They knew that the particles throughout the rings ranged from large to small. They thought material in the gap would look the same. But the sampling showed mostly tiny, nanograin- and micron-sized particles, like smoke, telling us that some yet-unknown process is grinding up particles. What could it be? Future research into the final bits of data sent by Cassini may hold the answer.

Saturn and its rings are even more interconnected than scientists thought. Cassini revealed a previously unknown electric current system that connects the rings to the top of Saturn’s atmosphere.

Scientists discovered a new radiation belt around Saturn, close to the planet and composed of energetic particles. They found that while the belt actually intersects with the innermost ring, the ring is so tenuous that it doesn’t block the belt from forming.

Unlike every other planet with a magnetic field in our Solar System, Saturn’s magnetic field is almost completely aligned with its spin axis. Think of the planet and the magnetic field as completely separate things that are both spinning. Both have the same center point, but they each have their own axis about which they spin. But for Saturn the two axes are essentially the same – no other planet does that, and we did not think it was even possible for this to happen. This new data shows a magnetic-field tilt of less than 0.0095 degrees. (Earth’s magnetic field is tilted 11 degrees from its spin axis.) According to everything scientists know about how planetary magnetic fields are generated, Saturn should not have one. It’s a mystery physicists will be working to solve.

Cassini flew above Saturn’s magnetic poles, directly sampling regions where radio emissions are generated. The findings more than doubled the number of reported crossings of radio sources from the planet, one of the few non-terrestrial locations where scientists have been able to study a mechanism believed to operate throughout the universe. How are these signals generated? That’s still a mystery researchers are looking to uncover.

For the Cassini mission, the science rolling out from Grand Finale orbits confirms that the calculated risk of diving into the gap – skimming the upper atmosphere and skirting the edge of the inner rings – was worthwhile.

Almost everything going on in that region turned out to be a surprise, which was the importance of going there, to explore a place we’d never been before. And the expedition really paid off!

Analysis of Cassini data from the spacecraft’s instruments will be ongoing for years to come, helping to paint a clearer picture of Saturn.

To read the papers published in Science, visit: URL to papers

To learn more about the ground-breaking Cassini mission and its 13 years at Saturn, visit: https://www.nasa.gov/mission_pages/cassini/main/index.html

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.

Excuse me everyone i’m gonna go become a minor god of crows now

Megalith Cist Burials Found in Southern India

Archaeologists have uncovered a total of 250 cairn circles in southern India’s trade and industrial center of Kodumanal, which was inhabited from the 400s through first century B.C.E.

The cairn circles were made of giant rocks, or megaliths. Most of the cairn circles were around rectangular chambers built of megaliths, which in turn contained burial cists and three or four bowls or pots. The pottery was likely for offerings placed outside the burial cists, showing a belief system that included something after death.

An impressive ten pots and bowls were recently unearthed in a larger circle made of boulders and rectangular-shaped cists made of stone slabs, surrounding a three-chambered burial. This larger, more complex burial might have been intended for someone important in the community.

From the invention of wireless to Radio Broadcast to Space

The word radio was coined in 1907 after a decade of furious activity to discover the mechanism for wireless transmission.  A decade earlier, French physicist Édouard Branly coined the term radioconductor to describe a means of wireless transmission.  He based his term on the verb radiate which ultimately came from the Latin word radius meaning the spoke of a wheel, a ray or beam of light.  The word radio was first used by itself in a 1907 article by Lee De Forest. It was used five years later by the Navy to distinguish it from other wireless technologies and entered common usage in the next decade.  Radio technology advanced so quickly that a little over 50 years later on November 16, 1974, scientists broadcast the first interstellar radio message out to the stars, a program that later became known as METI, the Message to Extra-terrestrial Intelligence. To date, only 9 messages have been transmitted by a variety of organizations:

{The Morse Message (1962)}

Arecibo message (1974)

Cosmic Call 1 (1999)

Teen Age Message (2001)

Cosmic Call 2 (2003)

Across the Universe (2008)

A Message From Earth (2008)

Hello From Earth (2009)

RuBisCo Stars (2009)

Wow! Reply (2012) 

The first radio message, known as the Morse Message, does not technically belong on this list as the Russians directed the message to Venus, and thus the primary mission was not Interstellar.  The message targets vary in distance from the very short (the majority of targets are under 100 light years away) to the very far, including the Arecibo Message, which targets the M13 globular cluster 24,000 light years away.  

While there have been some dissenting voices who argue that ‘revealing’ our location to enemy or hostile alien civilizations is ill-advised at best, most scientific consensus agrees that due to the physical restrictions on speed and travel (as currently understood) we are in no danger of imminent attack.  While the Arecibo Message won’t reach its target for another 25,000 years or so, the first of the other messages should arrive by 2029.  Other scientist point out that our current terrestrial radio and television broadcasts represent their own METI signal and thus we have no need to fund additional broad- or narrow-cast messages.  

Image of the Arecibo Radio Telescope courtesy Marius Strom under a Creative Commons 3.0 share alike license.  

Image of the Arecibo Message of 1679 bits in the public domain.  

After about a decade of slowly making friends with all the local crows in our neighborhood by feeding them peanuts when we go out walking, and putting peanuts out on our porch when they’re watching us, about three years back a pair of crows started bringing their fledgling by our porch to get peanuts. He was nervous at first but they showed him that it was safe and led him through the steps of cautiously getting nuts. Like one of his parents (we’re using male pronouns out of laziness, we can’t actually tell the gender of any of the crows), he has a funny habit of ruffling up his feathers into a big puff-ball, something we’ve really only seen this one and his parent do. We called his parent Fluffy because of this habit, so the fledgling was dubbed Fluffy Junior, often called just Junior.

Junior grew up coming by our porch for peanut treats, and following Jack and me when we go out walking. He’s easy to pick out because he’s far less skittish around us than any of the other crows who come to us for treats, and because he’s continued to do the fluff-ball thing. At first he came along with his parents, and then eventually just him, and then last winter he started bringing another crow along with him who was a lot more nervous around us than Junior or his parents had ever been.

Then for awhile this spring, we were only seeing Junior or his very skittish mate, never both of them together, and about two weeks back we finally found out why – Junior has a fledgling! They brought the baby over to the rooftop that’s across from our porch and fed him there, within easy access of the porch treats. The crow we’ve known since he was a baby now has a baby of his very own, and is carrying on the tradition of introducing the baby to us young.

So today we could hear Junior and his mate feeding the baby across the way – and if you’ve never heard crow fledglings being fed, it’s a very distinctive noise that sounds like a crow is being loudly strangled, and if you see it in process, you’ll notice that one crow has a much smaller beak that opens much wider and is bright red on the inside. When you know what to listen and look for, you can pretty easily spot fledglings being fed this time of the year, and often hear it from as much as a block away.

We want to encourage Junior to keep bringing his mate and their baby over to our place (and hopefully outlast the work-from-home era of our hateful neighbor who comes outside and claps at the birds when they make too much noise), so we put out some peanuts and a little bit of cheese for them, which is their absolute all time favorite treat. 

We figured Junior or his mate would get the food and continue to feed their baby on the roof like they’ve done frequently since the beginning of the month, but instead the entire family of three flew over and landed on our porch, and fed the baby right there, about four feet from our door, while Jack and I hid behind the curtains to get a look without spooking them. 

That’s a show of trust that not even Junior’s parents attempted, and it’s so exciting to think that this third generation of this little family will grow up that comfortable with being so close to us. They’re still rightfully skittish about being watched too closely, and we would never try to approach them or touch them, but it is lovely to get to see them behaving so calmly from such a close distance.

Gosh I love my crows.

WHY THE TRIASSIC????

What the FUCK is so WEIRD about the Triassic?

Well I will TELL YOU! 

Okay so first of all, the Triassic is SUPER DUPER OLD. In the grand scheme of the Earth, sure, it happened relatively recently, but working on the scale of the entire geologic time span of the Earth’s existence is not exactly fair: 

I mean, animals that we can recognize today didn’t show up until that line in the Phanerozoic (Hadean is the oldest stuff), so like, it’s smack dab in the middle of THAT 

Look, basically, here’s what happened: 

- The earth Formed. Life Appeared. Chaos reigned (4,600 million years ago until 4,000 million years ago) 

- Life began to become more complex. Some life began to stick its blueprints inside of pockets so they’d be safer. They then swallowed other life forms that were better at getting energy, but kept them around like a buddy inside of them. Some of these guys could make a shitton of oxygen. This made the earth cool and a lot of shit die out super duper quickly. Extinction rate unknown. (4,000 million years ago until 2,500 million years ago) 

- Climate change and fluctuating oceans allow life to start to group up together into SuperLife aka Multicellular Things. These multicellular things got more and more complicated. Some became animals and started moving around a lot. Some plants went on land. Some things were super weird looking and mysterious. LOTS of experimentation by life. Things start to change and a lot of these early experiments go extinct. Extinction rate unknown. (2,500 million years ago until 541 million years ago) 

- Animals can suddenly burrow underground and go absolutely apeshit and diversify faster than you can say “wait a second whAT THE FUCK IS THAT”. Ice Age causes Death, 85% of species die out. (541-444 million years ago) 

- Fish suddenly have a chance to be weird too and some of them decide, what the heck, let’s crawl onto land. Why not, right? Some other animals decide to join them. Plants make everything super cold, 75% of all species die out. (444-359 mya) 

- Land-vertebrates start to diversify. They try out a lot of new things, but there aren’t a lot of them yet. So there’s still a lot of experimentation in body plans. Mammal-relatives are actually some of the most diverse ones. Reptiles are fairly rare. A GIANT MASS EXTINCTION CAUSED BY A GIANT LAVA FIELD EXPLODING KILLS ~95% OF LIFE ON EARTH. (359-252 mya)

- NEW animals get to try to diversify and do lots of crazy shit in the wake of SO MANY JOBS IN THE ENVIRONMENT GETTING CLEARED OUT. Reptiles diversify so fast you don’t know what the heck is happening. Other animals also take this opportunity to do new and weird shit. VOLCANOS EXPLODE, KILL ~80% OF LIFE (252-201 mya) 

- Dinosaurs finally get to do fun things now that other reptiles are no longer being weird. Modern life starts to show up. (201 mya-today). 

BASICALLY: 

- Land Animals had only just started to diversify and try out new funky things with their bodies in order to cope with the challenges of terrestrial life 

- Then a giant mass extinction killed everything. Mass exinctions are bad news for a lot of shit that’s specialized for the environment that’s been destroyed, BUT it allows things that make it through to have a chance to try out new shit to fill all those empty jobs in the environment 

- So, generalist reptiles, who hadn’t had a chance to do jack diddly squat before, now suddenly had the whole planet to play with. And the other animals around them, from mammal-cousins to amphibians to fish to insects to other invertebrates, also got to try out some new stuff in this new world 

- AND THEN ANOTHER MASS EXTINCTION HAPPENED RIGHT AFTER THAT RESET THE CLOCK AGAIN

This means that the TRIASSIC has some of THE MOST UNIQUE ANIMALS TO HAVE EVER EVOLVED IN EARTH’S HISTORY. Experiments were tried, rapidly, and MANY were lost RIGHT AWAY. It’s not like the life that evolved after that, which was honestly similar to what we see today - or those that evolved after the end-Cretaceous extinction, which was even more like today. These were weirdos that appeared and were wiped out before they could continue on to today 

And, because this was a rapid evolutionary period, we see the starts of many of today’s modern groups of animals, and they’re super weird, too! 

Honestly, the only weirder period in Earth’s history is the Cambrian Explosion, when animals first started doing anything notable at all 

On top of THAT, the ENTIRE EARTH was ONE GIANT SUPERCONTINENT called Pangea! Everyone could go everywhere! There were no terrestrial barriers to movement! So many creatures spread all over the globe. It was a HOTSPOT of biodiversity and a major turning point in Earth’s History

But, because the dinosaurs that evolved in the Triassic were kind of Meh, it doesn’t get enough press!!!!!!!!!!!!! 

So, we’re going to cover the Weird and Wonderful animals of the Triassic - we have a carefully curated list of Weirdos ready to take Tumblr by storm, and we hope you’ll enjoy learning about these amazing animals right along with us! You’ll have to wait till tomorrow to see them, though - don’t want to give away the surprises! 

GET! PUMPED! 

IT’S TRIASSIC TIME!

Ratnagiri petroglyph, India. 10,000 BC...

Timelapse view of clouds over the rugged terrain of northeast India, during Monsoon rain season.

Burst of Celestial Fireworks

“You’re basically seeing all of the sunrises and sunsets across the world, at once, being reflected off the surface of the moon” – NASA