Science
What Is The Oldest Planet Ever Found?
The sun formed around 4.5 billion years ago, and all the planets began forming soon after. All the planets in our solar system are about 4.5 billion years old, which truly is an immense period of time. However, it is nowhere near as old as the oldest planet ever discovered. The oldest planet ever found in the universe is an exoplanet designated as PSR B1620-26 b at nearly 13-billion years old. It has also been nicknamed Methusalah, after the oldest character from the bible.
Discovery
Unlike most exoplanets discovered, Methusalah does not orbit a typical star. Rather, it is a circumbinary planet, meaning it orbits two different objects. These two objects, however, are not main sequence stars. Rather than stars, Methusalah orbits a white dwarf and a pulsar. Interestingly, Methusalah was one of the first planets ever detected beyond our solar system, although since it does not orbit a main sequence star, it does not technically fall under the definition of an exoplanet. The existence of Methusalah was announced in 1993, and like most planets beyond our solar system discovered at that time, it was found using the radial velocity method. This method looks for any shift in a star’s light caused by the Doppler Effect, which will change the wavelength of light depending on the object’s motion relative to us. In the case of Methusalah, astronomers observed a Doppler shift in the light of the nearby pulsar, and calculations showed that the most likely explanation was that a planet was exerting a gravitational force on the pulsar, causing it to move ever so slightly.
Age
In addition to Methusalah being the oldest planet ever discovered, it is also unique in that it was the first planet ever found to orbit more than one object, and it was also the first planet ever found within a globular cluster of stars. The globular cluster, designated as Messier 4, has an estimated age of 12.7 billion years and is located 12,400 light years away. Globular clusters tend to be quite old, which is due to the abundance of low mass stars that can burn for hundreds of billions of years contained within them. Globular clusters can also contain thousands to millions of individual stars, their mutual gravity holding the structure together for billions of years. Most stars within globular clusters likely formed within the cluster itself, and so any planets that orbit within the globular cluster are likely the same age. Thus, Methusalah is estimated to be around 12.7 billion years old, making it the oldest planet ever found and 2.8 times older than the Earth.
Characteristics
Methusalah has a mass 2.7 times larger than Jupiter, meaning it is likely a gas giant. It orbits at a distance of 2.1 billion miles (3.4 billion kilometres) and takes approximately 100 years to complete a single orbit. Other than its age, mass, and distance, not much more is known about this ancient planet, yet astronomers believe that it may have once orbited a star not so different from our sun. It is unlikely that Methusalah formed in orbit around the white dwarf and pulsar as their gravity is simply not strong enough to pull in enough material for a planet to form. Rather, astronomers believe that Methusalah likely formed around a sun-like star that eventually became a white dwarf. Methusalah is located at a far enough distance that it would have survived the red giant phase of the star just prior to the formation of the white dwarf.
Science
Asteroid Apophis will visit Earth in 2029, and this European satellite will be along for the ride
The European Space Agency is fast-tracking a new mission called Ramses, which will fly to near-Earth asteroid 99942 Apophis and join the space rock in 2029 when it comes very close to our planet — closer even than the region where geosynchronous satellites sit.
Ramses is short for Rapid Apophis Mission for Space Safety and, as its name suggests, is the next phase in humanity’s efforts to learn more about near-Earth asteroids (NEOs) and how we might deflect them should one ever be discovered on a collision course with planet Earth.
In order to launch in time to rendezvous with Apophis in February 2029, scientists at the European Space Agency have been given permission to start planning Ramses even before the multinational space agency officially adopts the mission. The sanctioning and appropriation of funding for the Ramses mission will hopefully take place at ESA’s Ministerial Council meeting (involving representatives from each of ESA’s member states) in November of 2025. To arrive at Apophis in February 2029, launch would have to take place in April 2028, the agency says.
This is a big deal because large asteroids don’t come this close to Earth very often. It is thus scientifically precious that, on April 13, 2029, Apophis will pass within 19,794 miles (31,860 kilometers) of Earth. For comparison, geosynchronous orbit is 22,236 miles (35,786 km) above Earth’s surface. Such close fly-bys by asteroids hundreds of meters across (Apophis is about 1,230 feet, or 375 meters, across) only occur on average once every 5,000 to 10,000 years. Miss this one, and we’ve got a long time to wait for the next.
When Apophis was discovered in 2004, it was for a short time the most dangerous asteroid known, being classified as having the potential to impact with Earth possibly in 2029, 2036, or 2068. Should an asteroid of its size strike Earth, it could gouge out a crater several kilometers across and devastate a country with shock waves, flash heating and earth tremors. If it crashed down in the ocean, it could send a towering tsunami to devastate coastlines in multiple countries.
Over time, as our knowledge of Apophis’ orbit became more refined, however, the risk of impact greatly went down. Radar observations of the asteroid in March of 2021 reduced the uncertainty in Apophis’ orbit from hundreds of kilometers to just a few kilometers, finally removing any lingering worries about an impact — at least for the next 100 years. (Beyond 100 years, asteroid orbits can become too unpredictable to plot with any accuracy, but there’s currently no suggestion that an impact will occur after 100 years.) So, Earth is expected to be perfectly safe in 2029 when Apophis comes through. Still, scientists want to see how Apophis responds by coming so close to Earth and entering our planet’s gravitational field.
“There is still so much we have yet to learn about asteroids but, until now, we have had to travel deep into the solar system to study them and perform experiments ourselves to interact with their surface,” said Patrick Michel, who is the Director of Research at CNRS at Observatoire de la Côte d’Azur in Nice, France, in a statement. “Nature is bringing one to us and conducting the experiment itself. All we need to do is watch as Apophis is stretched and squeezed by strong tidal forces that may trigger landslides and other disturbances and reveal new material from beneath the surface.”
By arriving at Apophis before the asteroid’s close encounter with Earth, and sticking with it throughout the flyby and beyond, Ramses will be in prime position to conduct before-and-after surveys to see how Apophis reacts to Earth. By looking for disturbances Earth’s gravitational tidal forces trigger on the asteroid’s surface, Ramses will be able to learn about Apophis’ internal structure, density, porosity and composition, all of which are characteristics that we would need to first understand before considering how best to deflect a similar asteroid were one ever found to be on a collision course with our world.
Besides assisting in protecting Earth, learning about Apophis will give scientists further insights into how similar asteroids formed in the early solar system, and, in the process, how planets (including Earth) formed out of the same material.
One way we already know Earth will affect Apophis is by changing its orbit. Currently, Apophis is categorized as an Aten-type asteroid, which is what we call the class of near-Earth objects that have a shorter orbit around the sun than Earth does. Apophis currently gets as far as 0.92 astronomical units (137.6 million km, or 85.5 million miles) from the sun. However, our planet will give Apophis a gravitational nudge that will enlarge its orbit to 1.1 astronomical units (164.6 million km, or 102 million miles), such that its orbital period becomes longer than Earth’s.
It will then be classed as an Apollo-type asteroid.
Ramses won’t be alone in tracking Apophis. NASA has repurposed their OSIRIS-REx mission, which returned a sample from another near-Earth asteroid, 101955 Bennu, in 2023. However, the spacecraft, renamed OSIRIS-APEX (Apophis Explorer), won’t arrive at the asteroid until April 23, 2029, ten days after the close encounter with Earth. OSIRIS-APEX will initially perform a flyby of Apophis at a distance of about 2,500 miles (4,000 km) from the object, then return in June that year to settle into orbit around Apophis for an 18-month mission.
Related Stories:
Furthermore, the European Space Agency still plans on launching its Hera spacecraft in October 2024 to follow-up on the DART mission to the double asteroid Didymos and Dimorphos. DART impacted the latter in a test of kinetic impactor capabilities for potentially changing a hazardous asteroid’s orbit around our planet. Hera will survey the binary asteroid system and observe the crater made by DART’s sacrifice to gain a better understanding of Dimorphos’ structure and composition post-impact, so that we can place the results in context.
The more near-Earth asteroids like Dimorphos and Apophis that we study, the greater that context becomes. Perhaps, one day, the understanding that we have gained from these missions will indeed save our planet.
Astronomy PhD candidate Veronika Dornan served as the astronomer in residence at Killarney Provincial Park. She’ll be back again in October when the nights are longer (and bug free). Dornan has delivered dozens of talks and shows at the W.J. McCallion Planetarium and in the community. (Photos by Veronika Dornan)
BY Jay Robb, Faculty of Science
July 16, 2024
Veronika Dornan followed up the April 8 total solar eclipse with another awe-inspiring celestial moment.
This time, the astronomy PhD candidate wasn’t cheering alongside thousands of people at McMaster — she was alone with a telescope in the heart of Killarney Provincial Park just before midnight.
Dornan had the park’s telescope pointed at one of the hundreds of globular star clusters that make up the Milky Way. She was seeing light from thousands of stars that had travelled more than 10,000 years to reach the Earth.
This time there was no cheering: All she could say was a quiet “wow”.
Dornan drove five hours north to spend a week at Killarney Park as the astronomer in residence. part of an outreach program run by the park in collaboration with the Allan I. Carswell Observatory at York University.
Dornan applied because the program combines her two favourite things — astronomy and the great outdoors. While she’s a lifelong camper, hiker and canoeist, it was her first trip to Killarney.
Bruce Waters, who’s taught astronomy to the public since 1981 and co-founded Stars over Killarney, warned Dornan that once she went to the park, she wouldn’t want to go anywhere else.
The park lived up to the hype. Everywhere she looked was like a painting, something “a certain Group of Seven had already thought many times over.”
She spent her days hiking the Granite Ridge, Crack and Chikanishing trails and kayaking on George Lake. At night, she went stargazing with campers — or at least tried to. The weather didn’t cooperate most evenings — instead of looking through the park’s two domed telescopes, Dornan improvised and gave talks in the amphitheatre beneath cloudy skies.
Dornan has delivered dozens of talks over the years in McMaster’s W.J. McCallion Planetarium and out in the community, but “it’s a bit more complicated when you’re talking about the stars while at the same time fighting for your life against swarms of bugs.”
When the campers called it a night and the clouds parted, Dornan spent hours observing the stars. “I seriously messed up my sleep schedule.”
She also gave astrophotography a try during her residency, capturing images of the Ring Nebula and the Great Hercules Cluster.
“People assume astronomers take their own photos. I needed quite a lot of guidance for how to take the images. It took a while to fiddle with the image properties, but I got my images.”
Dornan’s been invited back for another week-long residency in bug-free October, when longer nights offer more opportunities to explore and photograph the final frontier.
She’s aiming to defend her PhD thesis early next summer, then build a career that continues to combine research and outreach.
“Research leads to new discoveries which gives you exciting things to talk about. And if you’re not connecting with the public then what’s the point of doing research?”
Eyes to the skies, Vancouver, because between now and September 1st, stargazers can witness the ‘best meteor shower of the year’ according to NASA.
Known for its “long wakes of light and colour,” the Perseid Meteor Shower will peak on August 12th, 2024 – so consider this list a great place to start if you’re in search of a prime stargazing spots!
Grab your lawn chairs and blankets, and seek as little light pollution as possible. Here are some ideal stargazing spots to check out in and around Vancouver this summer.
Recent Posts:
This island with clear waters has one of the prettiest towns in BC
10 beautiful lake towns to visit in BC this summer
Wreck Beach
If you’re willing to brave the stairs and the regulars, it doesn’t get much better than Wreck Beach for watching the skies – for both sunsets and stargazing. The west-facing views practically eliminate immediate distractions from the city lights.
Spanish Banks Park
Spanish Banks is the perfect mixture of convenience and quality. Its location offers unobstructed views of the skies above, and it’s far enough away from downtown to mitigate some of the light pollution.
Burnaby Mountain Park
If it’s good enough for a university observatory, it’s good enough for us. Pretty much anywhere on Burnaby Mountain will offer tremendous viewpoints, but the higher you get the better (safely).
Porteau Cove
A short drive from Vancouver gets you incredible views of the Howe Sound from directly on the water. And naturally, its distance from any nearby community makes it a prime spot for stargazing.
Cypress Mountain
In addition to having one of the best viewpoints in Vancouver period, Cypress Mountain (and the road up to it) is also a great place to watch the sky. For a double-whammy, we say that you come around sunset, then hang out while the sky gets dark. Sure, it might take a few hours, but the view is worth it.
So there you have it, stargazers! Get ready to witness a dazzling show this summer.
New Alpha Nutrition
Very Woo-Woo – 3rd Eye Money Magnet: Best Trending Offer!!
Flames fans, players remember Gaudreau brothers at vigil in Calgary
Silver investment demand jumped 12% in 2019
12 Bizarre Things People Did Just To Make Social Media Content
Global Media Markets, 2015-2020, 2020-2025F, 2030F – TV and Radio Broadcasting, Film and Music, Information Services, Web Content, Search Portals And Social Media, Print Media, & Cable – GlobeNewswire
-
News11 hours ago‘The deal is done:’ NDP Leader pulls out of supply and confidence deal with Liberals
-
Health5 hours ago
Manhood Miracle
-
Sports5 hours ago
US Open: Jessica Pegula upsets No. 1 Iga Swiatek to reach her first Grand Slam semifinal
-
Health4 hours ago
Ancient Tonic Discovered 6,092 Years Ago By “Seer Of The Gods”… Boosts T — Restores “Horse Power” Libido And Energy In Just 8 Seconds…
-
News8 hours ago
Couche-Tard Inc. reports Q1 profit down from last year as consumers watch spending
-
News5 hours ago
Canfor shutting two northern B.C. sawmills affecting 500 staff, blames U.S. tariffs
-
News22 hours ago
Egyptian President el-Sissi makes his first visit to Turkey, as relations thaw
-
News8 hours ago
Roaring Game Returns: Olympic qualification a key storyline this curling season
