Elder millennials were technically alive the last time Halley’s Comet came around, though most of us were still learning to walk. And it won’t officially be back until 2061.
But there’s a way to see pieces of it this week. NASA meteor expert Bill Cooke suggested something for anyone who doesn’t want to wait another 35 years. “For those who haven’t seen Comet Halley, if you don’t want to wait for its return, you can at least go out and see the Orionids,” he told CNN. This year’s Orionid meteor shower peaks tonight, Wednesday, Oct. 21, into Thursday morning.
Every October, Earth passes through a trail of dust and rock left behind by Halley’s Comet. Those particles burn up in our atmosphere, giving us the Orionids. The same comet debris also produces the Eta Aquariids meteor shower in May. Meanwhile, Halley’s Comet is out near Neptune’s orbit, absolutely nowhere near us.
And these things freaking move. Orionid meteors enter Earth’s atmosphere at around 41 miles per second, making them some of the fastest meteors we can see. They can produce bright streaks, the occasional fireball, and glowing trails that hang around for a few seconds afterward.
A Meteor Shower Made From Halley’s Comet Is Peaking Tonight. Here’s When to Look Up.
Unfortunately, the moon isn’t doing anyone any favors this year. A bright waxing gibbous moon will wash out many fainter meteors on Wednesday night. According to NASA, your best chance comes after it sets around 3 a.m. local time. Under ideal conditions, the Orionids can produce 10 to 20 meteors per hour, although people in suburban areas will probably see closer to three to six.
If you’re going to watch, find somewhere away from city lights and give your eyes time to adjust. Bring a blanket and something comfy to sit on, especially if you’ll be out there a while. You won’t need a telescope, and there’s no reason to stare directly at Orion. The meteors can appear anywhere in the sky.
Fun fact: Mark Twain had an interesting connection to Halley’s Comet. He was born in 1835, the year it passed, and predicted he’d die when it returned. In 1909, he wrote, “I came in with Halley’s Comet in 1835. It is coming again next year, and I expect to go out with it.” He died on April 21, 1910, one day after the comet reached its closest point to the Sun.
If you’re willing to get out of bed at 3 a.m., you might catch a few pieces of the same comet. At least you won’t have to wait another 35 years.
Earth’s core is leaking, and it has been for a long time.
Earth’s core, frankly, sounds insane. It’s a molten ball covered in a lava ocean that spews lethal gases and occasionally ejects some of itself through volcanoes. It used to be so wild that the planet was uninhabitable, but it eventually settled down enough for humans to exist on it.
According to a study in Science Advances by researchers at the University of Science and Technology of China, that core is constantly oozing chemical leftovers from the birth of our Solar System. For years, scientists have debated whether these weird deep-Earth ingredients get trapped in the mantle when the planet first cooled, or whether Earth’s core is slowly leaking material into the outer layers.
The Center of Earth Is Leaking Ancient Material, and Scientists Are Trying to Understand Why
To figure it out, scientists used computer simulations to model how hydrogen moves. Like sodas or cigarettes, hydrogen comes in a “light” version and a “heavy” version. The heavy one is called deuterium. If early Earth froze, the heavy and light versions would be mixed pretty evenly everywhere. But when scientists look at lava from volcanic hotspots in Iceland and Baffin Island, they find way more of the superlight version of hydrogen.
This means that the original cooling process couldn’t have caused this current setup. Instead, light hydrogen trapped in the planet’s metal core billions of years ago, when the Sun was forming, is actively leaking into the mantle like air from a punctured tire.
This light hydrogen, along with ancient helium and tungsten, rides hot lava streams to the planet’s surface, meaning that for the past several billion years ancient gases trapped in Earth’s core have been slowly burping their way out.
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