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...

Why Do I Still Rant About Astrology?

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A few years ago I filmed a vlog ranting about Astrology being nonsense and I'm now revisiting the subject, not because something has changed (it's still bullshit), but because...

Why does Iapetus have two colours?

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Iapetus is the third largest satellite of Saturn, and it is the largest object in the solar system not in hydrostatic equilibrium. Iapetus is a moon of Saturn known for its colour dichotomy. It has a dark side and white side, and it is often called the Yin Yang moon.

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...

I’m the Universe, hear me roar.

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The cosmos has plenty of terrifying Lovecraftian features, but one of my favourites is the Space Roar. There is a loud radio signal, described as a constant hiss, that seems to pervade the cosmos. It is louder than the radio signature of radio galaxies, and it is without explanation.

What Would Happen If The Sun Disappeared ? – AGAIN!

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In a previous post, I discussed how long the Earth would be able to survive without the Sun. We had to assume that our star would magically disappear into...

“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...

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...

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