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Uncovering the chemistry of interstellar house

June 2, 2025
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Many individuals think about the house between the celebs as an empty, chilly infinity. In actuality, it’s teeming with extraordinary molecules: Greater than 300 differing types have already been found. For her Ph.D. thesis, chemist Kim Steenbakkers studied numerous molecules right here on Earth and contributed to proving the existence of at the very least one in every of them in house. She’s going to defend her analysis at Radboud College on 3 June.

“The situations in house are utterly completely different from these right here on Earth,” says Steenbakkers. “It is rather chilly, round -240°C, and the strain may be very low. There are far fewer collisions between molecules than on Earth: right here, there are a billion collisions per second, whereas in house there may be one each 10 days.”

Which means that sure molecules that happen in house can’t survive right here on Earth. There are too many different molecules right here that they’d collide with instantly, inflicting them to ignite within the air or kind new molecules. However how do you examine these molecules?

Steenbakkers says, “On the HFML-FELIX laser and magnet lab, they’ve an infinite fridge that may cool right down to -270°C and in which you’ll cut back the strain. This creates situations just like these in house.” The chemist then despatched a robust infrared laser by means of the molecule to see how it could react.

She did this with the charged molecules C2H+ and HC2H+, that are thought to happen in house. “We do not have these molecules on Earth as a result of they react instantly with different molecules right here. However we do have laser gasoline, which is used for welding. That is C2H2 and is similar to HC2H+ and C2H+.”

Welding gasoline is very flammable and reacts instantly with air throughout welding. However should you take that welding gasoline, put it in a machine and fireplace quite a lot of electrons at it, it breaks down and you may extract HC2H+ and C2H+.

By then firing an infrared laser at these charged molecules, Steenbakkers was capable of get hold of a type of “fingerprint” of those molecules. To do that, she needed to arrange completely new experimental strategies and develop superior theoretical fashions to grasp the information. “After getting such a fingerprint and perceive it, you’ll be able to see if we are able to discover it within the knowledge collected by telescopes.”

The tactic utilized by Steenbakkers has already helped discover one other of those unique ions: CH3+, which is methane (CH4) with one much less H. This molecule was noticed within the Orion Nebula with the James Webb House Telescope, in an space the place stars are born. “However we count on this molecule, and the others I investigated in my thesis, to happen in lots of extra locations in house.”

Steenbakkers states, “If we all know precisely what the chemistry of house seems to be like, we are able to deduce how stars and planets are shaped and the way far a nebula is in its life cycle. In the end, it may additionally inform us one thing about how life on Earth originated and whether or not life can come up on different planets.”

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Radboud College


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