No Radio Signals from Oumuamua

To help rule out Oumuamua as an interstellar probe, it was investigated and found to have no detectable transmissions within 1-10 GHz down to powers of at least 300 milliwatts. Yes, this could be like an uncontacted tribe on Earth in 2018 saying that the drone that surfaced in their bay wasn't sent by people because it didn't give off smoke signals - but you have to start with clear assumptions of SOME kind and test them. That such a ship-like object is passing through the solar system is exciting, but since we found it very soon after we were first capable of finding it suggests that such objects pass through our solar system all the time.

The Interstellar Urey-Miller Experiment

Summary here. At 5.5 K in Interstellar ice you get aromatic ring precursors. Note - the materials from the original experiment remain at UCSD where Miller was professor of chemistry, but the rig they used is at a museum in Denver.

XKCD - Expanded Hertzprung-Russell Diagram

Reminds me of the interesting factoid: on a power-per-mass basis, our sun produces less Wattage than reptile metabolism. (Reptiles! Doesn't even approach mammals, an order of magnitude greater!) But that surface area-to-volume ratio is important, and as the XKCD author pointed out previously, if you had a whole planet made of mammals, it would put out a fair amount of energy in an unexpected scale-dependent phenomenon, although metabolism would not continue - turns out where powering stars is concerned, fusion beats glycolysis or respiration.