Taking a Hit

Jupiter's New Bruise
Jupiter's New Bruise

Between the hours of 6am and noon EDT on Monday, July 20, something smashed into Jupiter, the largest planet in our solar system. And here’s the scar to prove it.

First noticed as a dark blotch by amateur astronomer Anthony Wesley, monitoring the giant planet via telescope from Australia, the impact was soon confirmed via near-infrared imaging by NASA astronomers at JPL using the giant telescope at the Keck Observatory in Mauna Kea, Hawaii.

Although it hasn’t been proven exactly what hit Jupiter, this is reminiscent of the Shoemaker-Levy 9 incident from almost exactly 15 years ago, when a comet on course for Jupiter broke apart before impact and struck the planet as a string of smaller chunks. The scars from the collisions became visible from Earth as Jupiter rotated into view.

This is only a single impact, but the result seems to be the same: a dark visible smudge on Jupiter’s cloudtops and infrared images showing a large amount of heated material churned up from deep inside the planet.

“It could be the impact of a comet, but we don’t know for sure yet…It’s been a whirlwind of a day, and this on the anniversary of the Shoemaker-Levy 9 and Apollo anniversaries is amazing.” – Glenn Orton, JPL scientist

Scientists are using this opportunity to learn more about the composition and behavior of Jupiter’s atmosphere. Eventually the scar will disappear, being absorbed into the churning clouds of the gas planet. Being mostly atmosphere, there’s no solid surface to be damaged by an impact like this….even though the bruise is easily as large as our whole planet.

This is also a good example of how we are actually protected by the giant Jupiter, orbiting far beyond Mars and the asteroids. Objects coming toward the sun from the outer solar system that could have posed a danger to Earth are instead drawn to the giant planet, which can take a hit without flinching. So thanks Jupiter. Took one for the team.

Read the whole story here.

UPDATE: read the associated blog post from the JPL scientists here.

Image: NASA/JPL/Infrared Telescope Facility


  1. Lauri says:

    Hi, Jason!
    My daughter was asking about this incident so I brought her here for the info and the pics! Thanks for being here! 🙂


    1. J. Major says:

      And thanks for visiting! Personally I think my site is great (toot toot!) for educators because of the photo-based, concise article styles with links to more info. I try to explain things in plain English whenever I can, and stay timely to current events.

      This incident in particular is a big deal, since actual “events” don’t always happen regularly, especially not when people are actually able to spot them in real time. “Recent” in astronomy can mean anything from yesterday afternoon to several hundred million years ago.

      Plus it’s a little reminder that there are lots of bits flying around our solar system that whack into things every now and then. Jupiter took two good-sized hits within the last 15 years alone…hits that would have altered life on our planet in a catastrophic way. Luckily the big guy can take it. We can’t.

      A good hint to the leaders of the world to pay more attention to how we can protect our planet and less trying to outsmart each other in U.N. summits.


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