It feels about time that age-old question "why is there something rather than nothing?" should notice it's old age and finally die off. While the question seemed all-important and pertinent to the ancients, what we now know about the nature of the universe renders it obsolete.
The universe in colour! ...or not. The object I'm focusing on today is almost completely black, it gives off virtually no radiation of any sort.
It is not difficult to find online forums and blog posts that proclaim facts and arguments as if they were certain. People of all philosophical alignments will do this. Theists will proclaim what they believe to be indisputable facts like: "Something must have caused the Big Bang", and atheists are often guilty of prophetically declaring their favourite origin story for the universe: "Quantum fluctuations produced the universe" or "Many-worlds explains fine-tuning".
There is a split in the philosophical community with regards to this issue. By and large, the majority of philosophers of physics claim that space and time are real and important entities, but there is a small faction who maintain that space and time are just useful theoretical constructs that don't have the independent existence we sometimes attribute to them.
We can get most of the way to deriving the constancy of the speed of light just from the Principle of Relativity alone. In other words, the speed of light being constant is just a consequence of the laws of physics being the same in all inertial frames.
Although the purpose of the Drake Equation is to estimate the number of alien civilisations with which we could potentially make contact, in truth we have absolutely no idea how many alien civilisations are out there.