A “Christmas Star” will appear in the sky tomorrow night for the first time in almost 1,000 years.
According to NASA, our solar system’s two largest planets, Jupiter and Saturn, will come together on December 21 for a planetary conjunction popularly called the “Christmas Star.”
As they pass each other in the sky, the planets will be the closest they’ve been to each other in nearly 400 years. It will be the first time in close to 800 years that the alignment of Jupiter and Saturn will occur at night.
Officially known as the “Great Conjunction,” NASA said the gas giants will appear so close together tomorrow night that if you were to hold out a pinky finger, you could easily cover them both.
Despite appearing close together from Earth, the planets will still remain several hundred thousand kilometres apart out in space.
“The solstice is the longest night of the year, so this rare coincidence will give people a great chance to go outside and see the solar system,” said Henry Throop, an astronomer in the Planetary Science Division at NASA’s Washington headquarters.
To see the Christmas Star, NASA advises finding a spot, such as a field or park, that gives you an unobstructed view of the sky.
Look to the southwestern sky an hour after sunset. They say Jupiter will be bright and easily visible, while Saturn will be slightly fainter and will be to the right of its celestial neighbour.
The planets are bright enough to be seen with the naked eye from most major cities. But if you do have a small telescope or a pair of binoculars, you may be able to see four of Jupiter’s largest moons, too.
With the recent launch of Starlink, SpaceX set a record for rapid reuse – Sunday Vision
SpaceX continues to make strides as it pushes the boundaries of reusing the Falcon 9 first stage rocket.
On Wednesday morning, the company plans to launch the next batch of 60 Starlink satellites, and reuse the booster number 1051. This will in fact be the eighth flight of this Falcon 9 rocket – setting a new record for the number of uses for any single rocket core. SpaceX expects to reach 10 uses of at least one stage of the Falcon 9 later this year.
The next launch attempt is also noteworthy as it would mark a rapid turnaround for this first phase. The missile last flew on December 13, launching the Sirius XM-7 mission in geostationary transport orbit. This 38-day period will significantly eclipse the previous Falcon 9 Phase 1 transformation margin, which is 51 days. This indicates that the company’s engineers and technicians are continuing to learn best practices for recovering and refurbishing the missiles.
The Starlink mission is scheduled to launch at 8:02 AM EST (13:02 UTC) on Wednesday from the Cape Canaveral Space Force Station in Florida. Its launch was originally delayed by 24 hours from Monday due to unfavorable weather conditions in the offshore recovery area, where Just read the instructions Will wait for the return of the first stage. Then the important company delayed an additional day, say More time was needed for “pre-launch inspections”. It is not clear if this refers to the missile or the payload.
This will be the sixteenth launch of “operational” Starlink satellites, in addition to an earlier launch of experimental satellites. This mission is already the largest satellite operator in the world, and will bring the total number of Starlink satellites launched by SpaceX to over 1,000. Some of these satellites are no longer operational, are in the process of exiting orbit, or have already done so.
In starting to build this constellation, SpaceX owns it Introducing a public beta To define the regions of North America and is expected to offer broader coverage later this year. First impressions It was generally positive.
At the same time, SpaceX is also working to address the concerns of scientists who are concerned that large constellations of satellites transmitting the Internet from space will distort the night sky and damage astronomical observations. Last year, the company started adding “masks” to reduce the reflection of its satellites. However, Recent analysis From these “DarkSats” they indicate that more effort may be required.
Weather conditions for launch on Wednesday appear favorable for the mission, both at the launch site and in the recovery area. SpaceX should start live 15 minutes before take off.
All-purpose dinosaur opening reconstructed – Science Daily
For the first time ever, a team of scientists, led by the University of Bristol, have described in detail a dinosaur’s cloacal or vent — the all-purpose opening used for defecation, urination and breeding.
Although most mammals may have different openings for these functions, most vertebrate animals possess a cloaca.
Although we know now much about dinosaurs and their appearance as feathered, scaly and horned creatures and even which colours they sported, we have not known anything about how the vent appears.
Dr Jakob Vinther from the University of Bristol’s School of Earth Sciences, along with colleagues Robert Nicholls, a palaeoartist, and Dr Diane Kelly, an expert on vertebrate penises and copulatory systems from the University of Massachusetts Amherst, have now described the first cloacal vent region from a small Labrador-sized dinosaur called Psittacosaurus, comparing it to vents across modern vertebrate animals living on land.
Dr Vinther said: “I noticed the cloaca several years ago after we had reconstructed the colour patterns of this dinosaur using a remarkable fossil on display at the Senckenberg Museum in Germany which clearly preserves its skin and colour patterns.
“It took a long while before we got around to finish it off because no one has ever cared about comparing the exterior of cloacal openings of living animals, so it was largely unchartered territory.”
Dr Kelly added: “Indeed, they are pretty non-descript. We found the vent does look different in many different groups of tetrapods, but in most cases it doesn’t tell you much about an animal’s sex.
“Those distinguishing features are tucked inside the cloaca, and unfortunately, they’re not preserved in this fossil.”
The cloaca is unique in its appearance but exhibits features reminiscent to living crocodylians such as alligators and crocodiles, which are the closest living relatives to dinosaurs and other birds.
The researchers note that the outer margins of the cloaca are highly pigmented with melanin. They argue that this pigmentation provided the vent with a function in display and signalling, similar to living baboons and some breeding salamanders.
The authors also speculate that the large, pigmented lobes on either side of the opening could have harboured musky scent glands, as seen in living crocodylians.
Birds are one the few vertebrate groups that occasionally exhibit visual signalling with the cloaca, which the scientists now can extend back to the Mesozoic dinosaur ancestors.
Robert Nicholls said: “As a palaeoartist, it has been absolutely amazing to have an opportunity to reconstruct one of the last remaining features we didn’t know anything about in dinosaurs.
“Knowing that at least some dinosaurs were signalling to each other gives palaeoartists exciting freedom to speculate on a whole variety of now plausible interactions during dinosaur courtship. It is a game changer!”
Dinosaur fossils could belong to the world's largest ever creature – CTV News
Experts have uncovered the remains of a gigantic dinosaur in Argentina, and believe it could be one of the largest creatures to have ever walked the Earth.
Paleontologists discovered the fossilized remains of a 98 million-year-old titanosaur in Neuquén Province in Argentina’s northwest Patagonia, in thick, sedimentary deposits known as the Candeleros Formation.
The 24 vertebrae of the tail and elements of the pelvic and pectoral girdle discovered are thought to belong to a titanosaur, a diverse group of sauropod dinosaurs, characterized by their large size, a long neck and tail, and four-legged stance.
In research published in the journal Cretaceous Research, experts say they believe the creature to be “one of the largest sauropods ever found” and could exceed the size of a Patagotitan, a species which lived 100 million to 95 million years ago and measured up to a staggering 37.2 meters (122 feet) long.
“It is a huge dinosaur, but we expect to find much more of the skeleton in future field trips, so we’ll have the possibility to address with confidence how really big it was,” Alejandro Otero, a paleontologist with Argentina’s Museo de La Plata, told CNN via email.
Titanosaur fossils have been found on all continents except Antarctica. But the biggest “multi-ton” varieties of the species — including those titanosaurs exceeding 40 tons — have mostly been discovered in Patagonia.
Without analyzing the dinosaur’s humerus or femur, experts say it is not yet possible to say how much the creature weighs. However, the partially recovered dinosaur “can be considered one of the largest titanosaurs,” experts said, with a probable body mass exceeding or comparable to that of a Patagotitan or Argentinosaurus.
Patagotitans may have been the world’s largest terrestrial animal of all time, and weighed up to 77 tons, while Argentinosaurus were similarly gargantuan, and measured up to 40 meters (131 feet) and weighed up to 110 tons — weighing more than 12 times more than an African elephant (up to 9 tons).
Experts believe that the specimen strongly suggests the co-existence of larger titanosaurs together with medium-sized titanosaurs and small-sized rebbachisaurids at the beginning of the Late Cretaceous period, which began 101 million years ago.
“These size differences could indeed explain the existence of such sauropod diversity in the Neuquén Basin during the Late Cretaceous in terms of niche partitioning,” they wrote.
Researchers said that, while they don’t believe the creature to belong to a new species, they have so far been unable to assign it to a known genus of dinosaur.
The research was conducted by Argentina’s The Zapala Museum, Museo de La Plata, Museo Egidio Feruglio and the universities of Río Negro and Zaragoza.
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