Summer Solstice

Also a Father’s Day in United States. Congratulations to all the fathers, it is, unironically, an important task.

Since today is a celestial event, this is a good place to mention an update on K2-18b, this potentially hycean exoplanet, that may or may not harbor life (it resides in a habitable zone of a red dwarf but the spectral signs of biosignature molecules are not very reliable and the molecules may also have been formed by abiotic means.) Now, SETI had included this solar system to their radioastronomical survey for alien radio signals. They did not find any, but got plenty of data for future negative controls.

IMHO, microbial life on exoplanets and larger moons is likely (how common is another matter), but assumption that alien civilizations would communicate via strong radio transmissions seems oddly specific. I expect that if we ever find proof of advanced material civilizations, it would be something like Dyson structures or remnants of extraterrestrial advanced materials not formed by natural processes.

I thought to get some photos of the sunset of the longest day of the year, but gray clouds had crept over and obscured the sky. It often happens in Berkeley, days are sunny but as the evening sets, the cloud cover spreads from sea to hills. I did not get up there, but in many nights, the blanket of water which is cloud cover over the flats is fog or mist in the hillside. So, instead, here is a picture of jasmine flowers, size reduced from the original taken earlier today.

These are either from South Berkeley or from North Oakland, the city border crosses the block where the plant grows.