Can a satellite hover over the Sun?

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 facts about the solar system...

Colliding stars

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 three classes: Stellar Mergers Binary collisions Stellar Collision Under...

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...

One Planet, One Climate, One culture.

One of my biggest pet peeves about sci-fi universe building is the lazy approach in building alien civilisations. We often see the trope showing one world, one climate, and one language. Given the variety...

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...
Credit: Wikicommon

Black Holes and Impossible Planets

Black holes are incredibly fascinating. They represent the unknown, the dangerous, the terrifyingly majestic. They are the modern version of the void, the abyss, the bottomless pit. Most sci-fi gets black holes right, but...

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...

PodcAstroholic – Life On Other Planets

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

What Would Happen To The Earth If The Sun Would Disappear?

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 cannot survive, or at least...
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...

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