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Stranded Soviet spacecraft to plunge again to Earth : NPR

May 11, 2025
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NPR’s Don Gonyea speaks with astrophysicist Jonathan McDowell about Kosmos 482, the Soviet-era spacecraft that was stranded over 50 years in the past throughout a mission to Venus. It’ll quickly return to Earth.



DON GONYEA, HOST:

We have got a Kosmos 482 coming proper up. No, no, it isn’t a cocktail. It’s a spacecraft. The Soviet-era planetary probe, Kosmos 482, was despatched from Earth on a mission to Venus within the 12 months 1972. Nevertheless, technical malfunctions ensued. It went off beam, and the spacecraft by no means made it out of Earth’s orbit. It has now been caught in that orbit, circling and circling and circling for over 50 years. However now, it looks like Kosmos 482 would possibly lastly be coming residence, as scientists predict it is going to plunge again to Earth someday this month. Jonathan McDowell is an astrophysicist on the Harvard-Smithsonian Heart for Astrophysics. He’s right here to assist us make sense of this fascinating story. Welcome.

JONATHAN MCDOWELL: Thanks. Sure. It is a enjoyable, little occasion.

GONYEA: So describe the spacecraft – how huge is it, what’s it appear to be, all of that.

MCDOWELL: Proper. It is a sphere about 3 ft throughout. It is about half a ton, so like the burden of a small automobile. And it was designed to outlive entry into the hellish Venusian environment. However the rocket stage malfunctioned, and so it did not have sufficient pace to flee Earth’s gravity. And so it ended up in an orbit that had its preliminary low level of solely about 150 miles, and the excessive level was as excessive as 6,000 miles. And so each hour or so, it will loop across the Earth taking place to 150, as much as 6,000. And each time it goes down, it plows by means of the outer fringe of Earth’s environment, slows down a tiny little bit, so it does not go fairly as excessive the following time. But it surely took 50 years to bleed off sufficient top to deliver it down now to being on the sting of reentry.

GONYEA: OK, the way in which you describe that – to bleed off sufficient top – it is so, so gradual.

MCDOWELL: That is proper. And now it is in its remaining dying plunge.

GONYEA: So folks listening are in all probability considering to themselves, OK, we’re at all times listening to about satellite tv for pc X, Y or Z falling out of orbit, burning up within the environment earlier than they hit the bottom, and that is that. Will that be the case with Kosmos 482?

MCDOWELL: Nicely, as a result of it has a warmth defend and it was designed to outlive the trials of Venus’ environment, what I anticipate is as an alternative of burning up and melting, it is going to reenter primarily undamaged. And so someplace on Earth, this half ton sphere will fall out of the sky at a pair hundred miles an hour. And most definitely it’s going to be over the ocean, and nobody will ever know.

GONYEA: Overwhelmingly probably that it hits a physique of water, one of many oceans or some unpopulated house, some unpopulated space, however you by no means know.

MCDOWELL: You by no means know. There is a not trivial probability that it may hit someplace the place it damages property. And there is a small probability – nevertheless it’s like one in hundreds – that it may harm someone (ph).

GONYEA: Kosmos 482 – it was alleged to go to Venus. It by no means made it. It is coming again residence. Who is aware of the place? That is Jonathan McDowell, astrophysicist on the Smithsonian Observatory situated at Harvard College. Thanks, Jonathan, and we have got our onerous hats helpful right here.

MCDOWELL: Completely. I am able to duck.

(SOUNDBITE OF MUSIC)

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Accuracy and availability of NPR transcripts might differ. Transcript textual content could also be revised to appropriate errors or match updates to audio. Audio on npr.org could also be edited after its authentic broadcast or publication. The authoritative document of NPR’s programming is the audio document.



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