How Many Planets in the Universe? | Part 1: Our Galaxy

Have you ever wondered just how many planets there are in the Universe? So have we! We haven't surveyed the entire Universe (!) but based of the occurrence rate of planets in our local part of the cosmos, we can try to carefully extrapolate the total. In Part 1 of this mini-series, we focus on our galaxy, the Milky Way and explain why even here there is a great deal of uncertainty.

::More about this Video::

► Cassan et al. (2012), "One or more bound planets per Milky Way star from microlensing observations": https://arxiv.org/abs/1202.0903
► Sumi et a...