Why Does The Moon Go Red During An Eclipse?

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I know why the moon goes red during a total eclipse. But why does it not go red until near totality? Phil, London This is actually a very interesting question, with...

PodcAstroholic – Why is the Solar Corona so hot?

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In this PodcAstroholic we answered the question "Why is the solar corona hotter than the surface of the Sun?" UPDATE!!! I got a scolding (or a scalding since we are talking...

Meet The Tardigrades

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https://www.youtube.com/watch?v=GnYSsSEBZnE There's a creature on earth that can survive the most extreme conditions on (and thanks to humans off) the planet! It's called a tardigrade, but people also call it a...

A Galaxy Interaction That Deceives The Eyes

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This NASA/ESA Hubble Space Telescope photograph is one of my favourite images of interacting galaxies, but it's actually a bit of a cheat. The galaxies are not interacting at...

What’s the speed of Gravity?

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For all intents and purposes gravity travels at the speed of light but it is very hard to measure, and so far we have no direct model-independent measurement of the...

A Ghostly Cradle Of Stars

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If you wonder where we came from and how we got here, there's a step we are quite confident on. About 5 billions of years ago, before the Sun...

Has anyone got a recipe for artificial gravity?

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One of the underlying ideas in Einstein's general relativity is that for an observer, the acceleration due to gravity, or the acceleration due to thrust, are identical. This is...

What Would Happen To The Earth If The Sun Would Disappear?

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The Sun is responsible for all life on Earth and most of our planet's means of energy production depends on the Sun. We are told that without it we...

Can anyone hear us?

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Assuming that there are other intelligent civilisations out there in the universe, what is the likelihood that we'll ever be able to communicate? The key to answer this question is...

Destroying the One Ring in Space

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I was asked by Larry, one of my students, about what would be the best place in the solar system to destroy the One Ring. Since the 25th of March is the anniversary of its destruction and the fall of Sauron I thought I’d dedicate this vlog to answering the question as seriously and as accurately as possible.