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The Ethics of Timetravel

I recently talked about how time travel to the past is unlikely to be possible. That came with the label that we haven't found a law that tells us that it's impossible just yet....

All about the Asteroid Belt

What does it actually look like in the asteroid belt? Is it anything like as dense as is shown in films? Or is it more like you can see one or two rocks in...

Calories in anti-matter

Dear Mr Science Guy, How many calories would get in a bottle of antimatter? How long would it take to burn off at the gym if you drank it? Thank you, Rob, age 30 Rob asks a very...

Can anyone hear us?

Assuming that there are other intelligent civilisations out there in the universe, what is the likelihood that we'll ever be able to communicate? The key to answer this question is to look at the Drake...
Credit: Stephen van Vuuren

Something out of Nothing

If the 1st Law of Thermodynamics is true how could the Universe begin from nothing? To answer this question we need to remember that nothing is a global term and not a local one. Vacuum states exist...

Why Does The Moon Go Red During An Eclipse?

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 an (unfortunately) unsatisfying answer. But...

Stars of the Future

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 the elemental make-up of these...

What Would Happen If The Sun Disappeared ? – AGAIN!

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 nothingness. My friend Gavin asked online: “Can...

What’s the speed of Gravity?

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 speed of gravity. Physics has...

“The Stars Were Aligned”

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 Harry's statement that "the stars...

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