PodcAstroholic – Life On Other Planets

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

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.

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...

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...

PodcAstroholic – Main Challenges To Put A Human On Mars

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In this PodcAstroholic we answer the question "What are the main challenges to send a human to Mars?"

Time management.

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"Can you build me a hyperbolic time chamber? I'll buy you a coke." Friend of mine while we were walking down the street. Almost 110 years ago our view of time...

Colliding stars

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I know that likelihood of stars colliding is very low, but have there been papers describing the theoretical process of star collision? James, London I think we can divide star-collision into...

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.

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 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...