Although actively-forming gullies are common in the middle latitudes of Mars, there are also pristine-looking gullies in equatorial regions.
In this scene, the gullies have very sharp channels and different colors where the gullies have eroded and deposited material. Over time, the topography becomes smoothed over and the color variations disappear, unless there is recent activity.
Changes have not been visible here from before-and-after images, and maybe such differences are apparent compared to older images, but nobody has done a careful comparison. What may be needed to see subtle changes is a new image that matches the lighting conditions of an older one. Equatorial gully activity is probably much less common—perhaps there is major downslope avalanching every few centuries—so we need to be lucky to see changes.
MRO has now been imaging Mars for over 16 years, and the chance of seeing rare activity increases as the time interval widens between repeat images.
Enhanced color image is less than 1 km across.
ID: ESP_072612_1685 date: 22 January 2022 altitude: 263 km
NASA/JPL-Caltech/UArizona
Moving from one scene to another in your short story or novel can be challenging. If your plot spans more than a day or a week, you've got plenty of time to cover.
How do you transition your scenes without jumping over crucial plot points or making the pacing feel rushed?
There are a few tips you can try when you're facing this problem.
Let's say you've started a chapter with your protagonist encountering people they don't like while shopping at the grocery store with their exhausted two-year-old. The experience is frustrating, so your protagonist is simmering while sitting at a red light on the way home.
The main action of the chapter happens when the babysitter arrives that night, but it's only 12 o'clock in your scene. You needed your protagonist to encounter the people that annoy them to establish motivation for the action later on.
You could jump time by teasing the action itself. Your protagonist could thrum their fingers on the steering wheel and glare at the red light.
They opened their arms to the resentment churning under their skin. It sank into their bones, morphing into electricity that kept [Protagonist] plodding through their day. The red light mocked their need to take action, but they could wait.
Because when the babysitter showed up that night, they would take their revenge out on the city.
That could be a great place for a scene break or even the end of your chapter, depending on how much you've written. The reader won't mind a time jump because their interest gets piqued. They'll want to know what revenge means for that character and what will spin out from the choices they make.
If you're writing a 3rd person POV story with perspectives from at least two characters, you can also transition scenes by switching narrators.
While one character completes a plot-relevant action, the other could move the plot along by being a bit further in the future.
Consider something like this as an example:
Sarah's heart beat wildly in her chest as the heavy words finally fell from her lips. It was just the two of them in that park, but it had felt like the whole world had watched her admit her love for Melanie in the molten gold rays of the setting sun. All she needed now was an answer.
[Scene break symbol or the start of a new chapter]
Melanie heard Sarah's heartfelt words echo in her ears long after she had mumbled something about needing time. Time to think, to process. Sarah had been so understanding, even when she dropped Melanie off at home right afterward and skipped their usual Facetime call that night.
It wasn't until Melanie woke up the next morning in a sweat that she realized she finally had to unearth her biggest secret—she had only started the friendship with Sarah because she'd been in love with Sarah's older sister since the second grade.
You could make that time jump into however long you needed. Play with the scene set up in particular and then give the page or two to whoever loves to read your writing. They could talk about if it felt like a rushed scene or if the time jump felt right for that moment.
Most of the time, I find myself struggling with a scene transition because the moment that I'm writing isn't finished.
Recently I was writing a scene with two friends in a wagon on their way to a new city. They have a great conversation that sparks some character development in-between plot points, but I could feel that conversation coming to a lull.
It felt like the right moment to insert a transition, but something didn't feel right.
I had to walk away from my work and come back to it to realize that I needed to wrap up the moment to move anything forward.
The solution I found was ending the conversation by making them appreciate their friendship more than before, based on what had been said, and then the protagonist ended the scene by reflecting on how they knew they could face anything in the new city with their friend by their side.
The next scene started with their wagon approaching the city walls after a night of sleeping under the stars. The reader will still understand that it took more time to reach their destination, but they don't have to read excessive details about the cold night air or hard ground under the protagonist's back to get to what they're most looking forward to—the arrival at the new city.
Nothing about that night would add anything to the plot, so dropping the overnight experience at the beginning of the sentence makes for a great transition to the next scene.
Whether you end a scene with a cliffhanger, a heartfelt moment, or by switching between points of view, your transitions should always help the plot.
You can always edit them while reworking the finished draft later or ask for beta reader opinions from the people who always love reading what you write.
hi my qualification for writing this guide to youtube art tutorials (though it may be applicable to other forms of media as well) is that i have watched over (roughly) 200 art tutorials of various length, artistry, content, style, and more
when we’re told “look up guides online” there’s not really much more to say on how to approach our research and taking them in, so if you’re a little lost in the vast sea of art help like i was as a wee bab, then this may help!
don’t feel bad for skipping - if something isn’t striking you as informative or helpful, don’t feel bad for moving right along and treating it like a sponsor
^ also applies for lengthy talking or deriving from the point, if you’re not up for it. you don’t need to sit through the artists’ whole spiel to learn how to draw hands.
if something isn’t making sense, reach out to communities for help, and go beyond youtube/tumblr. reddit and discord servers are also full of places to go to talk to more ppl
trust your gut! if someone’s style makes you go “hmm this feels wrong and objectifying”, it’s because it is - feel free to move right along
^ also applies for if it feels like the artist is just showing off and not explaining enough, or just posting for ego boost or to get coin.
… related tip but if an artist likes to rant about discourse as the primary thing on their channel, i know drama can be fun and juicy but please just avoid these people, because generally they’re either nasty and toxic-minded, or they seem to have some bs going on for them in the background
check out comments and online discussion to see how well received a popular artist is, and pay attention to their discourse to avoid any mistakes they unintentionally or even proudly display
the art program is not important!!! every art program has some level of similar functionality, some with more bells and whistles than others, and very rarely does one program lack a key tool the others don’t have. the hardest part is translating what your artist means when they say one thing but your program has another - but more often than not, some similar wording or like words are used for the same tool or setting.
^ this means you can watch that tutorial on how to draw legs for clip studio if all you have is firealpaca
Information over Entertainment! the best artists to find help in are ones who focus primarily on relaying information and less on colorful quirky editing - those kinds CAN be helpful, but in general i tend to find more useful tips in videos that feel more academic as opposed to more entertaining.
don’t feel bad for flatout ignoring advice. if you found something that works better for you, please use it. feel free to try new techniques as well if you’re feeling stuck or want a change of pace!
What words should you use when finding the right video? Think like a content creator, here. General words are best when searching for the right video, and in order to think of those words, you need to know the parts of art. Lines, anatomy, colors, values, background, perspective, etc - figure out which part or parts you struggle with, and use one term at a time.
What types of videos are for me? If you are a Fresh Brand New Baby Beginner Artist that doesn’t even know much about art letalone art programs, then stick to tutorials that are labelled “for beginners”. If you know your way around an art program but you’re still pretty new, then your average art tutorial should be most helpful. More entertaining artists should be ok to start with! If you know your way around art but not programs, look for “art program reviews”, then once you’ve picked one or a few to mess around with (though I really recommend one at a time), look for “(program name) intro to / introductory”. And if you are well aware of everything I’ve listed, then you’ll be needing “intermediary / intermediate” tutorials. These ones are best given by master artists who focus on academic presentation. If you’re a master, you don’t even need this tumblr post wyd 😂
Herschel’s view of new stars and molecular clouds by europeanspaceagency
Symmetry Magazine
How JWST will test models of cold dark matter
By Madeleine O’Keefe
Two projects in JWST’s first observation cycle will probe the nature of dark matter.
On Christmas morning of 2021, an Ariane 5 CEA rocket blasted off from Kourou, French Guinea. It carried with it the largest and most sophisticated space telescope ever built: the James Webb Space Telescope.
Since then, JWST has reached its orbit about 1 million miles from Earth, unfurled its tennis-court-sized sunshield, and aligned its 18 hexagonal mirror segments. The telescope’s first images are expected by summer.
Over the next decade, JWST will make cutting-edge observations to help scientists answer myriad outstanding questions in astronomy—including questions about the nature of dark matter.
Hot, warm or cold Dark matter is an enigmatic substance that scientists believe accounts for 85% of matter in the universe. But so far it has not been observed directly; scientists can infer dark matter’s presence only by observing its gravitational effects on normal matter.
Different theories posit different types of dark-matter particles. Dark-matter candidates considered “hot” or “warm” are particles that would have moved so quickly in the early universe that gravity would not have been able to confine them. On the other hand, dark-matter candidates considered “cold” are thought to have moved so slowly that gravity would have formed them into small dark-matter structures that eventually would have coalesced into larger, “clumpy” ones.
“Decades’ worth of computer simulations have tested how structure forms and grows under the hypothesis of cold dark matter,” says Matthew Walker, an associate professor of physics at Carnegie Mellon University.
Cold dark-matter simulations show dark matter clumping into small blobs, which encounter other blobs and merge together, continually snowballing until large structures like the Milky Way are formed. These gravitationally bound blobs of dark matter are known as halos.
JWST can see your halo Anna Nierenberg, assistant professor of physics at University of California, Merced, was awarded 39 hours of observing time during JWST’s Cycle 1 to look for small dark-matter halos.
Many models, including the baseline dark-matter model, predict the existence of small (107 solar mass) halos that do not actually contain galaxies. Such a halo would “just be a blob of dark matter” with no stars inside it, Nierenberg says.
If there are no stars within these blobs of invisible material, how can we even try to detect them? Nierenberg and her team of nearly 20 scientists in the US, Canada, the United Kingdom, Switzerland, Spain, Belgium and Chile are using a phenomenon called gravitational lensing.
Born of Albert Einstein’s theory of general relativity, gravitational lensing says that matter bends spacetime and, subsequently, any light that encounters it. If light from a distant source travels through the universe toward Earth and passes by a massive object—such as a blob of dark matter—the light will be warped around it. If the in-between object is massive enough, the light is deflected in such a way that we’ll see up to four images of the light source appearing around the mass.
Nierenberg’s group will measure the number of small dark-matter halos by observing a sample of quasars (supermassive black holes at cosmological distances surrounded by dusty accretion disks) that have been gravitationally lensed. Detecting small halos would be a triumph for the cold dark-matter theory; conversely, not detecting small halos would imply that cold dark matter does not exist.
Because the light from these quasars must travel a great distance in an ever-expanding universe, it is stretched along the way, pulling its wavelengths into the infrared range. The mid-infrared wavelengths they are observing are almost impossible to see with ground-based telescopes. “We’re going to be observing with absolute reddest bands that JWST can accommodate,” Nierenberg says.
These wavelengths cannot be observed by the Hubble Space Telescope, which studies gravitational lensing at visible wavelengths. And older space-based telescopes that can see in the mid-infrared don’t have the resolution to separate the different lenses. Making these observations in mid-IR requires the high spatial resolution that only the JWST can provide, Nierenberg says.
Daniel Gilman, a postdoc at the University of Toronto and one of Nierenberg’s co-investigators, says, “The kind of data that we can get with JWST is unique and much more powerful or constraining than the kind of data that we could get with Hubble or from the ground.”
Nierenberg says, “I really believe that this is going to be a huge scientific step forward.”
Looking far and wide Walker is leading another dark-matter project in JWST’s Cycle 1, but his group didn’t apply for observing time. Instead, they are using data that JWST is collecting for other programs.
Walker’s group’s “archival research” is looking inside dwarf galaxies to find wide binary stars, systems of two stars orbiting each other at relatively large distances (on the order of one parsec, slightly less than the distance between the sun and our closest neighbor, Proxima Centauri).
“Because [wide binary stars] are so far apart, they’re very fragile systems,” says Walker. “If, say, a little dark-matter halo were to fly past a wide binary-star system, it could exchange energy with either or both of the stars in that system. And it just takes a small fraction of a fraction of a percent increase in the energy of either star to rip the pair apart.”
If Walker’s team finds wide binary stars, “we can be reasonably confident that those sub-galactic cold dark matter halos don’t exist,” he says. “And that, then, would be a real problem for the cold dark-matter model in general.”
That’s what Katharine Lee, a junior physics major at Carnegie Mellon in Walker’s group, likes about the project. “I particularly think this research is really interesting because the current framework for what we think of as the structure of dark matter is the cold dark-matter model, and the research that Professor Walker’s doing could potentially invalidate that.”
If the group did not find wide binary stars, it could be a sign that they were destroyed by dark matter. But it would not prove that they were destroyed—they may just have never formed in these dwarf galaxies in the first place.
Walker says that JWST is an ideal tool for this search because of its “exquisite sensitivity to faint objects,” as well as the telescope’s abilities to take high-quality images and distinguish pairs of sources at very small separations. And thanks to its 21-foot-diameter primary mirror, JWST will see farther than any other telescope ever built.
“I think JWST is going to give us a new and really powerful angle,” says Jorge Peñarrubia, a professor at the University of Edinburgh and one of Walker’s co-investigators. “But even if that fails, we’ll find other ways.”
Indeed, there are many other techniques that scientists use to search for dark matter, including direct searches by physics experiments. And both Nierenberg and Walker are using gravitational lensing and wide binary-star methods on data from the Hubble Space Telescope while they wait for JWST to open its eyes.
Future JWST science programs might further explore the mysteries of dark matter, whether through gravitational lensing or perhaps by observing statistics of galaxy evolution that scientists can then compare to dark-matter theories.
“We don’t lack theories of what dark matter could be. There are a lot of them,” Gilman says. “What we lack are observations that wield a lot of constraining power over these theories. And that’s something that JWST is going to give us.”
Illustration by Sandbox Studio, Chicago with Olena Shmahalo
When snacktime beckons in the deep sea, salmon snailfish wiggle wiggle those little chin-fins (which are actually modified pectoral fins) in the sand—but it’s all in good taste. Those whiskers are covered in tastebuds, and can help them sus out small crustaceans, like amphipods and crabs, hidden in the muck!
More than 11,000 years ago, young children trekking with their families through what is now White Sands National Park in New Mexico discovered the stuff of childhood dreams: muddy puddles made from the footprints of a giant ground sloth.
Few things are more enticing to a youngster than a muddy puddle. The children — likely four in all — raced and splashed through the soppy sloth trackway, leaving their own footprints stamped in the playa — a dried up lake bed. Those footprints were preserved over millennia, leaving evidence of this prehistoric caper, new research finds.
The finding shows that children living in North America during the Pleistocene epoch (2.6 million to 11,700 years ago) liked a good splash. “All kids like to play with muddy puddles, which is essentially what it is,” Matthew Bennett, a professor of environmental and geographical sciences at Bournemouth University in the U.K. who is studying the trackway, told Live Science. Read more.
Your writing will always feel awkward to you, because you wrote it.
Your plot twists will always feel predictable, because you created them.
Your stories will always feel a bit boring to you, because you read them a million times.
They won't feel like that for your reader.
I just reblog fun facts/tipsScience, nature, geology facts etc! + art & writing tips!
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