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PodcAstroholic – Jumping In A Black Hole

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In this 1 minute PodcAstroholic, we talk about what would happen if you jumped feet first into a black hole.

Can a satellite hover over the Sun?

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My friend Russell asked me under which condition an object would be able to stand still around the Sun. This is a very interesting question; it probes some fundamental...

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 – Can We Terraform Mars?

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In this PodcAstroholic we talk about the possibility to terraform Mars

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...

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...

Leaving The Universe Behind

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If the known universe was spherical would it be possible to move outside of it the same way a rocket can leave the Earth? Justin, New Zealand Oh that's an interesting...

What makes the worlds seem round?

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Are Mimas and Miranda the smallest known objects in hydrostatic equilibrium? Dan - London This question relates to the shape of astrophysical objects and as we discussed in the past, it's an...

Stars of the Future

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If the universe continues expanding forever, how long until it's too diffused to allow star formation? How many generations of stars will that mean the universe has? How will...

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...