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...

How big is the biggest galaxy in the Universe?

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If by big we mean physical dimension, the largest known galaxy is most likely IC1101. IC1101 is gargantuan even among galaxies; it's a super elliptical galaxy with a diffuse...

The Ethics of Timetravel

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I recently talked about how time travel to the past is unlikely to be possible. That came with the label that we haven't found a law that tells us...

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...

How do we know how massive stars are?

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As we discussed in the previous vlog our understanding of stars is still incomplete, but there are areas which we are very confident on what we know. In general we tend to know three things about stars: their brightness, their spectrum, and if they are close enough or of known luminosity, we can also know their distance.
Credit: Wikicommon

Black Holes and Impossible Planets

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Black holes are incredibly fascinating. They represent the unknown, the dangerous, the terrifyingly majestic. They are the modern version of the void, the abyss, the bottomless pit. Most sci-fi...

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...

“The Stars Were Aligned”

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Sometimes inspiration strikes in unusual ways at unusual times. I was tagged in a quote tweet where Prof Peter Coles states that as an astrophysicist he must contest Prince...

What’s going on with the moons of Jupiter?

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The orbit of Jupiter's moons are all messed up and seemingly overlap. Do they interact much? Greg, U.S. Jupiter has 67 confirmed moons. Of these, 8 are regular satellites with nice...

Travelling through the cosmos

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Space is big. The Voyager probe, launched in 1977 to explore Jupiter and Saturn, took 36 years to leave the Solar System. It is the furthest human object from...