The most dangerous club in the Universe

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What would a planet orbiting a pulsar look like from the ground? Would it look like a giant disco planet with a constant strobe light? Pulsar form from supernova explosions,...

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...

What Would Being In Space Without A Suit Be Like?

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Spacesuits are a fundamental tool for keeping astronauts safe in space, but the protection they supply is often mistaken, exaggerated or romanticised in science fiction.   Spacesuits are garments worn...

PodcAstroholic – How Can Spiral Galaxies Keep Their Shape?

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In this PodcAstroholic we answer the question "How can spiral galaxies keep their shape?"

Shopping for rings

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I have a space question. I know about the Roche limit but is there an upper limit to how big a ring can get compared to its planet? Asked by Dan Of course there are limits, the Universe is all about limits! But they're not as strict as one would think. We have found an object in 2012, J1407b, with a ring system 200 million kilometres in diameter. If the rings were centred on Earth they would cover the inner solar system all the way to the orbit of Mercury on the opposite side of the Sun.

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...

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...

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...

How galaxies influence planet formation

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Does the specific location of a solar system within a galaxy affect the solar system's structure? Like does distance from the centre affect how big the star is, or...

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...

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