Skip to Content
Uncategorized

Galactic Tide May Have Influenced Life on Earth

The galactic tide is strong enough to influence Oort Cloud comets, which means it may also have helped shape our planet.

The Moon’s tides have been an ever-present force in Earth’s history, shaping the landscape and the lives of the creatures that inhabit it. Now there’s a tantalising hint that the galactic tide may have played a significant role in Earth’s past.

The work comes from Jozef Klacka at Comenius University in the Slovak Republic. He has calculated the strength of the galactic tide and its effect on the Solar System. His conclusion is that the tide is strong enough to significantly effect the orbital evolution of Oort Cloud comets.

That’s a fascinating result. We’ve long known that the Moon’s tides must have been crucial for the evolution of life on Earth. The constant ebb and flow of the oceans would have left sea life stranded on beaches, forcing adaptations that allowed these creatures to cope with conditions on land.

Astrobiologists also believe that comets played an important part in the development of life on Earth because the atmosphere and oceans were seeded, at least in part, by comets. By that way of thinking, the forces and processes that have shaped evolution stretch to the edge of the Solar System.

But if the galactic tide plays a role in sending these comets our way, then it looks as if we’re part of a much larger web. Could it be that Earth and the life that has evolved here, is crucially dependent, not just on our planet, our star and our local interplanetary environment, but on the Milky Way galaxy itself?

Klacka has a lot more work to do to prove that the galactic tide plays such a role. But it might just be that the field of astrobiology has become a whole lot bigger.

Ref: arxiv.org/abs/0912.3112: Galactic Tide

Image courtesy of Jon Lomberg

Deep Dive

Uncategorized

stock art of market data
stock art of market data

Maximize business value with data-driven strategies

Every organization is now collecting data, but few are truly data driven. Here are five ways data can transform your business.

Mifiprex pill
Mifiprex pill

Where to get abortion pills and how to use them

New US restrictions could turn abortion into do-it-yourself medicine, but there might be legal risks.

image of library due date card on fire over black background
image of library due date card on fire over black background

The book ban movement has a chilling new tactic: harassing teachers on social media

Educators who stand up to conservative activists are being harassed and called “groomers” online, turning them into potential targets for real-world violence.

two images made by DALL-E 2
two images made by DALL-E 2

OpenAI is ready to sell DALL-E to its first million customers

But the company has had to rush out fixes to the image-making model’s worst flaws to do so.

Stay connected

Illustration by Rose WongIllustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at customer-service@technologyreview.com with a list of newsletters you’d like to receive.