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EarthDate is a weekly podcast providing a fun and informative interlude for listeners which focuses on the workings and complexity of our planet – its geology, its environment, and its major geologic events, both distant and more recent.

07/01/2025

The Earth’s solitary moon has influenced our planet for billions of years. How are moons of the planets in our solar system distributed, and how do planets capture and keep their moons? Today's EarthDate episode helps to answer that question. Listen here: https://www.earthdate.org/episodes/how-planets-get-moons

03/01/2025

The Earth’s year is defined by its annual voyage around the Sun. For part of the year, the Earth is closer to the Sun, and for part of the year, it is farther from the Sun. But if you live in the Northern Hemisphere, you might be surprised to learn that in the winter, The Earth is 3 million miles (5 million km) closer to the Sun than in summer! This is called the perihelion. Today's EarthDate episode observes this annual phenomenon. Learn more about it here: https://www.earthdate.org/episodes/winter-sun-close-encounter

31/12/2024

In late 2000, scientists exploring the mid-Atlantic Rift found hydrothermal vents called "black smokers". Surprisingly, these hosted a unique community of extremophiles. Today's EarthDate dives deep to research these strange creatures. Listen here: https://www.earthdate.org/episodes/life-in-hydrothermal-vents

27/12/2024

What is a second? Time can be measured from the coarse scale or the fine scale. The coarse-scale approach starts with the length of a day and divides it up into 86,400 seconds. The fine-scale approach starts with a very consistent measurement of the frequency required to cause energy level transitions in certain atoms. For cesium-133, this frequency is more than 9 trillion cycles per second. How do we measure the second today? Today's EarthDate episode takes a little time to answer that question. Hear it at: https://www.earthdate.org/episodes/just-a-second

24/12/2024

The Cold War race between the U.S. and the U.S.S.R. to drill into Earth's mantle proved to be too difficult an engineering challenge. But last year, the International Ocean Discovery Program finally made it. Today's EarthDate episode tells the story here: https://www.earthdate.org/episodes/drilling-into-earths-mantle

21/12/2024

Humans have both English and metric systems of measurement for just about everything else, but, thankfully, it is universally agreed upon that a day has 24 hours, an hour has 60 minutes, and a minute has 60 seconds. With our 10 fingers and 10 toes, we tend to operate in the base-10 world, so why are hours organized in multiples of 12 and minutes and seconds divided into 60? Today's EarthDate,episode takes just a second to answer that question. Listen to it at: https://www.earthdate.org/episodes/how-10-fingers-became-12-hours

17/12/2024

Recently, researchers observed Rakus, a male Sumatran orangutan, tend to a deep wound on his face with a medicinal plant. The wound closed in five days and healed in less than six weeks. Today's EarthDate episode describes how many animals treat themselves with medicinal plants. Hear it at: https://www.earthdate.org/episodes/orangutan-heal-thyself

13/12/2024

The great waterfalls of the world are wondrous sights, each unique in its own way. Several stand out by virtue of their sheer magnitude of width, average flow volume, and height. But you can’t view Earth’s tallest and most powerful waterfall without a submarine—it’s found underwater between Greenland and Iceland in the Denmark Strait. Today's EarthDate episode looks at the world's amazing waterfalls. Listen to it at: https://www.earthdate.org/episodes/wondrous-waterfalls

10/12/2024

Prehistoric tool makers became Earth’s first geologists, searching for just the right raw materials. Today's EarthDate episode recounts the vital relationship between the rocks that they made into stone tools and ancient hominids. Listen in at: https://www.earthdate.org/episodes/earths-first-geologists

26/11/2024

Earth’s largest organism is a fungus that covers four square miles in Oregon! It is a parasite that infests and kills conifers as it continually expands around its edges. Today's EarthDate episode visits this huge, 8,000-year-old mushroom. Listen here: https://www.earthdate.org/episodes/the-humongous-fungus-among-us

19/11/2024

Earth’s lava tubes can be 40 miles long, and may be even larger on other planets. As humans contemplate reaching out to Mars and beyond, lava tubes could play an important role. Today's EarthDate episode explores these potential habitats. Hear it at: https://www.earthdate.org/episodes/living-in-lava-tubes

12/11/2024

Twice in Earth’s history, microscopic mergers at the cellular level have enabled huge evolutionary leaps. Now scientists have observed a third such merger. Today's EarthDate episode looks closely at these cellular evolutionary advances. Listen hear: https://www.earthdate.org/episodes/when-small-organisms-merge

07/11/2024

125 years ago, Wilhelm Röntgen discovered he could make the invisible visible by using a new type of electromagnetic radiation that he called “X-rays”—he didn’t know what they were, so he named them after the mathematical variable “x.” Touted as a medical miracle in the early 1900s, today they are extensively used for everything from medical diagnostics, to material analysis, to security screening. They have even been used to determine the composition of Martian soil. Today's EarthDate epiode scans the history of X-rays. Listen here: https://www.earthdate.org/episodes/125-years-of-x-rays

05/11/2024

Landsat satellites monitor Earth’s surface using multispectral scanners that produce stunning digital images. The scanners were designed by physicist Virginia T. Norwood, known as the “Mother of Landsat.” Today's EarthDate remembers this brilliant woman: https://www.earthdate.org/episodes/mother-of-landsat

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