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How do starfish eat? – Hailey, 7, Maryland

December 1, 2022 melissamayer

Dear Hailey,

Starfish might have the coolest—and strangest—way of gobbling up a snack.

I learned all about it from my friend Cori Kane. She studied coral reefs when she was a biology Ph.D. student at Washington State University. Now she works for the National Oceanic and Atmospheric Administration. She writes policies to help protect the ocean and the animals that live there.

“Sea stars are probably one of the weirdest creatures. I don't know any other organism that basically barfs out its stomach to eat,” Kane said.

Yes, you heard that right. She said sea stars barf out their stomachs.

Dr. Universe: What can I do to help stop ocean pollution? -Hailey, 10

April 18, 2019 rcwebber

It’s great to hear you want to help our oceans. After all, they do a lot for us. Life in the ocean provides much of the oxygen we breathe and is also a source of food for many animals, including humans. One of the most important things we can do to prevent more pollution is to keep our garbage, especially plastic, out of the ocean. That’s what I found out from my friend Richelle Tanner, a marine biologist and researcher at Washington State University. While a lot of plastic ends up in the ocean, it actually started under the Earth’s surface in the form of oil, leftovers of plants and animals that died long ago. Read More ...

What is the deepest spot in the ocean? -Lawrence, 11, Philippines

June 15, 2016 rcwebber

Dear Lawrence,

Deep underwater, not too far from Guam, lies a crescent-shaped canyon called the Mariana Trench. It is home to the deepest known spot in the ocean: The Challenger Deep.

Why is the ocean salty? -Alysin, 10, Ruston, La.

April 18, 2016 rcwebber

Dear Alysin,

At first, I thought the answer to your question might take us deep into the ocean. But it turns out the source of our salty seas is actually on land.

If mollusks have such heavy shells to drag around with them, how have they spread all over the ocean? -Michel W.

August 10, 2015 rcwebber

Dear Michel,

Mollusks, from land snails and slugs to oysters and mussels in the sea, have a few things in common. They have a head. They have a soft middle part that holds their organs. Then, some have a muscle that’s known as a “foot.”

Dr. Universe: What is something a lot of people might not know about sharks?

July 10, 2015 rcwebber

It’s Shark Week, so I made a visit to my friend Jon Mallatt. He’s a Washington State University biologist who has studied the jaws of ancient sharks.

Jon Mallatt: Some of them, such as tiger sharks, cat sharks, and even great white sharks, have quite large brains—relative to their body weight— and are intelligent. They are not “primitive” animals. The shark relatives, Manta rays and devil rays, have even larger brains than any shark.

Dr. U: How long have sharks been around, anyways?

JM: At least 420 million years and maybe 460. It is … » More …