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...

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.

PodcAstroholic – Can We Terraform Mars?

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In this PodcAstroholic we talk about the possibility to terraform Mars

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.

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...

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...

PodcAstroholic – Life On Other Planets

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60 In this PodcAstroholic we talk about the likelihood of life on other planets

Would I survive a nuclear attack on London by hiding under my mattress?

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Last night I had a nightmare that the centre of London was nuked. In my half-sleep state I tried working out if I could survive just by getting under...

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...