Harvard scientists suggest 'Oumuamua is an alien device
It's an asteroid, it's a comet, it's actually a spacecraft?
- 'Oumuamua is an oddly shaped, puzzling celestial object because it doesn't act like anything naturally occurring.
- The issue? The unexpected way it accelerated near the Sun. Is this our first sign of extraterrestrials?
- It's pronounced: oh MOO-uh MOO-uh.
That odd-shaped visitor from beyond our solar system, 'Oumuamua (Hawaiian for "scout"), has been fascinating from the moment it arrived: It's a spaceship, it's a rock, it's a comet, it's not a comet. But is it a spaceship? That's where its behavior has some scientists at Harvard leaning; they suggest it may be a device of some kind powered by a lightsail, or a piece of one.
What's got experts so puzzled about 'Oumuamua is, as an about-to-be-published paper says: "'Oumuamua showed deviations from a Keplerian orbit at a high statistical significance." In English: It sped up as it approached the Sun. Comets can do this, but 'Oumuamua has been disqualified as an active comet, as it has no tail. Shmuel Bialy and Abraham Loeb, the authors of the paper, propose that the increase in speed could be due to "solar radiation pressure." The bottom line, they say, is that the discrepancy "is readily solved if 'Oumuamua does not follow a random trajectory but is rather a targeted probe." The paper discusses the math involved and finds that its "general results apply to any light probes designed for interstellar travel."
What we saw is what we get
That dot in the center is an actual image of 'Oumuamua.
'Oumuamua's gone from our view at this point, so any analysis of it or its movements is limited to the data collected during its period of observability. It was first spotted from the PAN-STARRS telescope on Maui (hence its Hawaiian name) on October 19, 2017, and by January 2018 it was gone. Any conclusions we draw have no way of being tested now.
At the time, 'Oumuamua was scanned for radio waves — a basic means of communicating which we assume/hope is the universe's lingua franca — and no radio waves were found, leading observers away from suspicions that its origin could be an alien civilization.
At first, 'Oumuamua was assumed to be an asteroid, but its subtle gain in speed as it drew near the Sun suggested a comet, and it still could be one, though of a kind with which we're unfamiliar. Comets accelerate near the Sun because, as NASA puts it, "Light and other radiation from the Sun push on the gas and dust in the coma, blowing the material away to form a tail that can be millions of kilometers long." The problem with 'Oumuamua is that it had no observable tail. In fact, we couldn't see it that well at all. As you can see in the photo above.
What did 'Oumuamua really look like?
We're all familiar with the shape ascribed to 'Oumuamua, as seen at the top of this article, but since the images really captured of 'Oumuamua showed it as a far-away dot, its presumed shape is a mathematically derived guess based on the way its brightness fluctuated, suggesting a tumbling, elongated object 10 times as long as it was wide. (Current calculations put 'Oumuamua at about 800 meters long.) The rest of its appearance was likewise deduced by its behavior. What many take to be its true appearance is just an artist's conception. So, we're used to feeling like we know what 'Oumuamua looked like, but we don't really know. If you find yourself thinking, "it sure doesn't look like an alien device," well, maybe.
Is 'Oumuamua a lightsail that remains from a larger craft?
The paper offers two theories, either of which would explain 'Oumuamua's odd acceleration. The first is that, "'Oumuamua is a lightsail, floating in interstellar space as a debris from an advanced technological equipment. Lightsails with similar dimensions have been designed and constructed by our own civilization, including the IKAROS project and the Starshot Initiative." Citizen-funded Planetary Society plans to launch one, simulated in the gif above, soon.
A lightsail is a device that uses in-space energy to propel craft via solar pressure. It uses the momentum from solar photons striking a large, thin, reflective sail. What's so interesting about craft powered by lightsail is that they can pick up the energy they need as they travel, rather than storing heavy fuel onboard.
Could 'Oumuamua be an actual probe deliberately sent here?
"A more exotic scenario is that 'Oumuamua may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization," suggests the paper. Apparently, if there were a lot of naturally occurring objects like 'Oumuamua, we'd be seeing lots of them. And we're not.
Two experts from SETI weigh in. And disagree.
Two scientists from SETI (Search for Extraterrestrial Intelligence), SETI director Andrew Siemion and senior astronomer Seth Shostak, have publicly commented on the conclusions drawn by Bialy and Loeb.
Siemion termed the paper "intriguing," telling The Globe that, "Observational anomalies like we see with 'Oumuamua, combined with careful reasoning, is exactly the method through which we make new discoveries in astrophysics — including, perhaps, truly incredible ones like intelligent life beyond the Earth." However, in an email to NBC, Shostak warned, "one should not blindly accept this clever hypothesis when there is also a mundane explanation for 'Oumuamua — namely that it's a comet or asteroid from afar."
LightSail: An experiment over 35 years in the making
Understanding thinking talents in yourself and others can build strong teams and help avoid burnout.
- Learn to collaborate within a team and identify "thinking talent" surpluses – and shortages.
- Angie McArthur teaches intelligent collaboration for Big Think Edge.
- Subscribe to Big Think Edge before we launch on March 30 to get 20% off monthly and annual memberships.
The Canadian professor has been on the Joe Rogan Experience six times. There's a lot of material to discuss.
- Jordan Peterson has constantly been in the headlines for his ideas on gender over the last three years.
- While on Joe Rogan's podcast, he explains his thoughts on the gender differences in society.
- On another episode, Peterson discusses the development of character through competition.
The blood of horseshoe crabs is harvested on a massive scale in order to retrieve a cell critical to medical research. However, recent innovations might make this practice obsolete.
- Horseshoe crabs' blue blood is so valuable that a quart of it can be sold for $15,000.
- This is because it contains a molecule that is crucial to the medical research community.
- Today, however, new innovations have resulted in a synthetic substitute that may end the practice of farming horseshoe crabs for their blood.
David Wallace-Wells points out that the people who can save the world just aren't all that interested.
- Saving the world from the apocalyptic impact of climate change should be a dream for many Silicon Valley titans concerned about legacy, says David Wallace-Wells, and yet few are dedicating themselves to addressing the catastrophe.
- Negative emissions technology funded by Bill Gates exists. It would cost $3 trillion per year to operate and would mean human industry could continue at current levels without global warming.
- That figure sounds astronomical, however global subsidies to fossil fuel industries cost $5 trillion per year.
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