After 66 Million Years, Scientists Say They’ve Found Where the Asteroid That Wiped Out the Dinosaurs Came From

The Chicxulub impact is the event that most scientists consider the cause of the extinction of the dinosaurs. Its crater is located in the Yucatan Peninsula in Mexico, estimated to have occurred about 66 million years ago. This is an asteroid that not only wiped out the dinosaurs but also 75% of all lifeforms on Earth.

It is estimated to be 10 to 15 km in diameter when it struck the planet, causing widespread fires, colossal tsunamis, and a massive blast wave. Fast forward to the present time, scientists have now identified where this asteroid came from, and when you think about it, its origin is important to know, just in case another one is heading our way.

Tracing the Roots: Ruthenium’s Clues

Scientists were able to determine the origin of the Chicxulub asteroid by analyzing the crater and focusing on the ruthenium isotopes trapped in the clay layer. They found isotope ratios matching carbonaceous or C‑type asteroids, the specific kinds known for being formed outside Jupiter’s orbit.

Since each part of the solar system contains varying amounts of Ruthenium isotopes, it acts like a fingerprint for the asteroids. In simple words, the presence of ruthenium in specific proportions suggests that this wasn’t from Earth’s geology or comet impacts—it originated from deep space, or from beyond Jupiter and possibly outside our solar system.

Scientists do not know exactly from which region of the galaxy the asteroid was formed, but some possible locations of its origins are the asteroid belt or even the Kuiper Belt. 

Read more: Science.org

Unveiling the Asteroid Type

Where Exactly Did the Dinosaur Killing Asteroid Come From? New Study

C-type asteroids are ancient and thought to have formed around 4.6 billion years ago. They make up most of the outer solar system asteroid belt, while S-type asteroids are more common in the inner solar system. After comparing the data from the samples in the Chicxulub crater and from known meteorites, researchers got a near-perfect match.

However, the analysis of earlier impacts, such as one from 470 million years ago or older, reveals a trend toward S-type asteroids. This means that the dinosaur ending event is rare and unique.

From Beyond Jupiter to Earth

The researchers suggest that the C-type asteroid from beyond Jupiter was affected by a gravitational perturbation that may have set the space rock on Earth’s path. In Astronomy, perturbations describe the complex movement of a celestial object, where it is subjected to external forces coming from a bigger planet or moon.

The Chicxulub asteroid was likely affected by Jupiter’s massive gravitational force that set it on its way to the inner solar system, eventually hitting Earth after millions of years of journey. This is a very rare scenario, but it can happen, and the dinosaurs’ reign on the planet likely ended because of it.

Read more: Phys.org

Why It Matters Today

66 million years ago, an era that lasted 180 million years, the Mesozoic Era ended with one big rock hitting Earth. It is estimated that our own species, Homo Sapiens, has only existed around 200,000 to 300,000 years ago. Which means these ancient animals have lived on this planet longer than we have.

If dinosaurs dominated for that long, but still ultimately met their end because of a rock from the outer solar system, then who are we to say that it will never happen to us? Knowing that our time on Earth could end in that same way gives us the necessary plan and preparedness to survive.

There’s an idea that mass extinction events always happen or are often triggered by unpredictable outer-system visitors, and this research reminded us. It will help planetary defense initiatives refine threat models, to not only focus on the asteroid that might hit Earth from inside the solar system, but also beyond Jupiter, our largest protector.

Important Details Emerge About The Origin of Dinosaur Killing Asteroid

Author's Final Thoughts

This discovery changes our planet’s origin story, and the extinction-level event that the asteroid caused came from beyond Jupiter, not near us. Rediscovering what happened in the past may not undo the extinction of the dinosaurs, but it will help us prepare for the future and prevent another one from happening.

Read more: Astronomers Suggest Earth May Be Trapped Inside a Giant Cosmic Void in Space