Aliens and ufos: what to you think?

[Beskar]

As for UFOs? Bah - we could detect any foreign object in our solar system easily enough to find any spaceship coming at us.

I remember reading about that, it would take a matter of milliseconds to detect some one lighting up a cigarette in orbit of mars simply because the energy readings are so low in the surroundings, lighting up a cigarette is like watching a firework display in your back garden on the sensors. Obviously, it becomes very clouded if you have other objects need by like the space-ship which can cloud the fact the astronaut lit up, but it is simply hypothetical.