Cosmos asked six scientists or astrobiologists what extraterrestrials might look like and they gave a wide range of opinions.
Does the Rare Earth hypothesis still stand up in the age of exoplanets? The authors of a book on the subject they wrote 20 years ago still think so.
Some experts think our advancing technology might allow us to discover alien civilisation within the next two decades.
A researcher has written a paper that might help whittle down the planets SETI should look at as part of its search for alien life.
The latest news from SETI is that there are 36 intelligent civilisations in the galaxy. Possibly. It’s all a bit limited by the sample size we’re using.
Why haven't aliens visited us? This is the Fermi Paradox and I look at some of the reasons why this might be the case.
A look at the Drake Equation, which is used to estimate the number of intelligent alien planets currently residing in the Milky Way galaxy. I plug my own numbers into it to see what comes out.