Astronomers on the hunt to confirm the possible presence of a Planet Nine within the outer parts of the Solar System have confirmed that
Astronomers are still searching for a hypothetical Planet Nine in the distant reaches of the Solar System, but an 11-Jupiter-mass planet called HD 106906b is looking more and more like the Planet Nine of its planetary system.
HD 106906 is a binary star system located 336 light-years from Earth in the constellation of Crux.
The system is about 15 million years old, and hosts a giant planet, HD 106906b, discovered by the Magellan Telescopes at the Las Campanas Observatory in 2013.
However, astronomers did not then know anything about the planet’s orbit.
This required something only the NASA/ESA Hubble Space Telescope could do: collect very accurate measurements of HD 106906b’s motion over 14 years with extraordinary precision.
A research team led by Meiji Nguyen from the University of California, Berkeley, determined that the planet circles the twin host stars at a distance of 730 AU once every 15,000 years, making it a distant cousin of Planet Nine.
The planet’s orbit is very inclined, elongated and external to a dusty debris disk that surrounds the stars.
“To highlight why this is weird, we can just look at our own Solar System and see that all of the planets lie roughly in the same plane,” Nguyen said.
“It would be bizarre if, say, Jupiter just happened to be inclined 30 degrees relative to the plane that every other planet orbits in.”
“This raises all sorts of questions about how HD 106906b ended up so far out on such an inclined orbit.”
The prevailing theory to explain how HD 106906b arrived at such a strange orbit is that it formed much closer to its stars — at a distance of about 3 AU.
However, drag within the system’s gas disk caused the planet’s orbit to decay, forcing it to migrate inward toward its stellar hosts.
The gravitational forces from the whirling twin stars then kicked it out onto an eccentric orbit that almost threw it out of the system and into the void of interstellar space.
Then a star passed very close by to this system, stabilising the exoplanet’s orbit and preventing it from leaving its home system.
This scenario to explain HD 106906b’s bizarre orbit is similar in some ways to what may have caused the hypothetical Planet Nine to end up in the outer reaches of our Solar System, beyond the Kuiper Belt.
“Despite the lack of detection of Planet Nine to date, the orbit of the planet can be inferred based on its effect on the various objects in the outer Solar System,” said Dr. Robert De Rosa, an astronomer at ESO.
“This suggests that if a planet was indeed responsible for what we observe in the orbits of trans-Neptunian objects it should have an eccentric orbit inclined relative to the plane of the Solar System.”
“This prediction of the orbit of Planet Nine is similar to what we are seeing with HD 106906b.”
The team’s paper was published in the Astronomical Journal.
SpaceX Starship prototype Lands Successfully then Explodes
SpaceX’s much anticipated Mars landing is closer than ever, after a prototype passed a high-altitude test by landing successfully on earth and exploding eight minutes later. The prototype went into the skies and landed with precision before the explosion.
Starship model SN10 was much close to the goal of a successful and safe vertical landing than versions SN8 and SN9 that came before it.
December 2020 saw SN8 perform its first high-altitude test flight which culminated in it demonstrating re-entry maneuvers before exploding during landing.
Last month, the SN9 completed a 10km flight before it landed in an explosion when one Raptor engine did not ignite.
SN10’s automated fire-suppression system came into play upon landing. The system involves a stream of water trained on the flames burning at the base. The Starship still exploded, after it had launched into the air and back into the ground. SN10 is a full prototype of the final design of the Starship.
SpaceX founder Elon Musk did not immediately comment on what went wrong, but he did tweet about the incident. “Starship 10 landed in one piece! RIP SN10, honorable discharge.”
“SpaceX team is doing great work! One day, the true measure of success will be that Starship flights are commonplace,” he added.
The Starship rocket will be a reusable launch vehicle that Musk hopes will make it affordable for humans to travel in space regularly. It will be 120cm tall and has a heavy booster.
The first round Starship flight will hopefully take place at the end of 2021. Musk hopes that he will take Yusaku Maezawa a Japanese billionaire on a trip around the moon aboard the starship by 2023.
In June 2020, Nasa astronauts Doug Hurley and Bob Behnken flew on the SpaceX to the International Space Station. It was the first time for the SpaceX rocket to take human beings to space. Elon Musk hopes that it will be only the first of many such trips.
eROSITA X-Ray Telescope makes Largest Supernova Remnant discovery yet
Scientists working with the eROSITA X-ray telescope have stumbled upon the most massive supernova remnant discovered yet using X rays.
Working from aboard the SRG (Spektrum-Roentgen-Gamma), the scientists want to put together X-ray technology, radio, and other wavelengths to detect supernova remnants.
“Our aim is to combine expertise across multiple wavelengths, from radio to X-ray, to search for hundreds of supernova remnants (SNRs),” explained co-author Dr. Natasha Hurley-Walker.
Walker is an astronomer with the Curtin University and works with the International Centre for Radio Astronomy Research (ICRAR).
Adds Walker: “The eROSITA telescope is 25 times more sensitive than its predecessor ROSAT so we expected to discover new SNRs in coming years, but were pleasantly surprised to have one appear straight away.”
The just discovered SNR is one of the largest to be found using X-Ray and has won the label G249.5+24.5. Only using radio waves have scientists succeeded in spotting larger supernova remnants.
Hoinga is a whopping 90 times larger than the moon. “Adding to our excitement, Hoinga is the largest SNR ever discovered via X-rays, in terms of apparent size: about 90 times larger than the full Moon,” Dr. Hurley-Walker said.
“An enduring mystery surrounding SNRs was the shortfall between the expected number of them in our Galaxy and the number actually identified through past surveys.”
“We expect there to be about 1,200 SNRs in our Galaxy, however only about 300 have been found so far,” Walker added.
“By sifting through archival radio data we discovered Hoinga had been sitting there waiting to be discovered in surveys up to ten years old, but because it was high above the plane of the Milky Way, it was missed.”
“SNRs are not typically expected to be found at high Galactic latitudes so these areas are not usually the focus of surveys, meaning there may be even more of these overlooked remnants out there waiting to be discovered.”
“The radio observations made it possible for us to work out that it is a middle-aged remnant relatively close to Earth, calculations that would have been far less accurate with the X-ray data alone.”
Hubble Snaps Breathtaking New Image of NGC 2336
Astronomy enthusiasts can gaze at a gorgeous new image of barred galaxy NGC 2336, captured by the NASA/ESA Hubble Space Telescope.
In the Hubble image NGC 2336 is clearly visible in the image. It is a spiral and barred galaxy that is 109 million light years from the earth and within Camelopardalis constellation.
To create the image, the telescope took multiple exposures within the regions of the spectrum that are visible to the naked eye as well as the infrared regions using the Hubble Advanced Camera for Surveys, or ACS.
The telescope used three filters to sample the wavelengths and assigned each hue with a monochromatic image linked to a specific filter. This produced the colored image.
The NGC 2336 is also known as the LEDA 21033 and UGC 3809. It is one half of a non-interacting pair of galaxies together with IC 467.
William Tempel, a German astronomer was first to spot the NGC 2336. Tempel was working with a 28 cm telescope when he spotted the galaxy in 1876.
The Hubble enjoys a much better view than Tempel’s rudimentary telescope once had. It is ten times larger than Tempel’s telescope.
NGC 2336 is 200,000 light years across and its arms are adorned with young stars glittering in blue light.
It has a smaller bar and eight spiral arms at the minimum. The central part of the galaxy is more red and occupied by older stars.
NGC 2336 went through a historic supernova in 1987. It was the only supernova to be observed within the galaxy ever since it was discovered by the German astronomer. It was a significant moment for astronomers who had been watching it for 111 years.
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