Comets that venture close to the Sun can transform into something beautiful, but sometimes they encounter incineration if they get too close. Of the various types of comets that orbit close to the Sun, astronomers had never seen the destruction of the type classified as “near-Sun” comets. But thanks to a variety of telescopes on summit of Mauna Kea in Hawai?i, scientists have now captured images of a periodic rocky near-Sun comet breaking apart. They say the disintegration of this comet could help explain the scarcity of such periodic near-Sun comets.Continue reading “Astronomers Watched a “Near-Sun” Comet Disintegrate as it Flew too Close to the Sun”
Comets, with their long, beautiful, bright tails of ice, are some of the most spectacular sightings in the night sky. This was most apparent when Comet NEOWISE passed by Earth in the summer of 2020, dazzling viewers from all over the planet while being mainly visible in the northern hemisphere. Even though the sky might look the same night after night, comets are a humble reminder that the universe is a very active and beautiful place.Continue reading “ESA Gives Green Light on its Comet Interceptor Mission”
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It’s official. Comet C/2014 UN271 (Bernardinelli-Bernstein) has the largest nucleus ever seen in a comet. The gargantuan comet was discovered in the fall of 2021, and in January 2022, astronomers turned the Hubble Space Telescope to ascertain more details and determine the exact size.
NASA said a team of scientists has now estimated the diameter is approximately 129 km (80 miles) across, making it larger than the state of Rhode Island. The nucleus is about 50 times larger than other known comets. Its mass is estimated to be a staggering 500 trillion tons, a hundred thousand times greater than the mass of a typical comet found much closer to the Sun.Continue reading “Hubble Confirms Comet C/2014 UN271 is an Absolute Unit, Astronomically Speaking”
In 2014, the Japanese Space Agency JAXA launched the Hayabusa 2 spacecraft to visit asteroid Ryugu. It arrived at the asteroid in June 2018 and studied it from orbit for over a year. Hayabusa 2 even dispatched four rovers to the asteroid’s surface. After departing, it flew past Earth in December 2020, dropping off a sample of Ryugu.
Of all the scientific results from that impressive mission, the most interesting one might be this: Asteroid Ryugu might not be an asteroid. It might be the remnant of a comet.Continue reading “Asteroid Ryugu Might Actually Be a Dead Comet”
Using ground-based and space-based observations, a team of researchers has been monitoring a difficult-to-see comet carefully. It’s called Comet 323P/SOHO, and it was discovered over 20 years ago in 1999. But it’s difficult to observe due to its proximity to the Sun.
They’ve found that the Sun is slowly tearing the comet to pieces.Continue reading “The Sun is Slowly Tearing This Comet Apart”
What if a 10 km (6.5 mile)-wide asteroid was on a bee-line towards Earth, with an impending, calamitous impact just six months away? This was the scenario in the recent Netflix film, “Don’t Look Up.” The movie has led many to wonder if we have the resources and technology ready and available today to avert such a disaster.
A new paper looking at the technical aspects of such an endeavor says yes. Yes, we do.Continue reading “We Already Have the Technology to Save Earth From a “Don’t Look Up” Comet or Asteroid”
Green is an unusual color in astronomy. It is the color to which our eyes are most sensitive, and yet few things in the night sky actually appear green. There are, for example, no green stars, only yellow-white, red, and blue ones. But there can be green comets, and we are still learning why.Continue reading “Why don’t Green Comets Have Green Tails?”
The new movie “Don’t Look Up” — now available on Netflix — is not your usual sci-fi disaster film. Instead, it is a biting parody on the general public’s dismissal and indifference to science. While the movie is about a comet on a collision course with Earth, filmmakers originally meant “Don’t Look Up” to be a commentary on climate change denial. But it also is reflective of the current COVID denial and mask/vaccine resistance, as well as our existing political polarization. It also lays bare our preoccupation with social media. While the movie is sometimes funny, it can also be depressing and frustrating.Continue reading “The Real Science Behind the Movie “Don’t Look Up””
Since early this year, skywatchers on Earth have been tracking Comet Leonard, a kilometer-wide dirty snowball made of ice, rock and dust. Now, as it heads towards a close encounter with the Sun on January 3, 2022, several spacecraft – with the distinct advantage of having an unobstructed front-row seat to the action – have been keeping an eye on how the comet is changing and evolving as it heats up.Continue reading “This Video of Comet Leonard (with Venus and Mercury) will Blow Your Mind”
A mega-comet – potentially the largest ever discovered – is heading from the Oort Cloud towards our direction. Estimated to be 100–200 kilometers across, the unusual celestial wanderer will make its closest approach to the Sun in 2031. However, the closest it will come to Earth is to the orbit of Saturn.Continue reading “The Biggest Comet Ever Seen Will get as Close as Saturn in 2031”