Cheap Astronomy - Dear Cheap Astro Ep. 123: The Big Questions

Asking questions and not always answering them.

Is there hope?

Well, sure. The question arises where the Drake Equation, aiming to quantify the likely number

of detectable intelligent civilizations out there includes a term representing the inherent risk of

any intelligent civilization destroying itself. It is just a risk, could be low could be high, but its

wide acceptance as a part of the whole equation does suggest we have some pessimism about

our own future.

Could dark matter be black holes?

Well, no. Firstly. we've discussed before how black holes can't really be dark matter. Dark

matter is not only invisible, but it's also transparent. Black holes can be invisible against a black

background and after all space is a black background.

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