"The Ambiguity of Exoplanet Biosignatures"
The search for life on planets beyond our Solar System is too often depicted as a binary process. One day, so the thinking goes, we'll be able to directly image an Earth-mass exoplanet whose atmosphere we can then analyze for biosignatures. Then we'll know if there is life there or not. If only the situation were that simple! As Alex Tolley explains in his latest essay, we're far more likely to run into results that are so ambiguous that the question of life will take decades to resolve. Read on as Alex delves into the intricacies of life detection in the absence of instruments on a planetary surface.
|
Fascinating astronomy thread about "Zoozve" aka Venus' quasi-moon
Great story about how one dad got curious about something on his kid's astronomy poster and came to learn something new about space.
|
"Scientists have found signs of a new kind of gravitational wave. It's really big"
I saw a TikTok explaining this last night and it is really fascinating.
When two galaxies merge, the enormous black holes at their centers are thought to come together and circle each other in a spinning dance that sends giant waves spiraling out.
These waves are like the ripples that move through a pond if you toss in a rock — only these waves move through the very fabric of the universe, and researchers have been eager to study them.
"We've been on a mission for the last fifteen years to find a low-pitched hum of gravitational waves resounding throughout the universe," says Stephen Taylor, a Vanderbilt University astrophysicist who serves as the chair of a team of researchers known as the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). "We're very happy to announce that our hard work has paid off."
Other research groups using telescopes in Europe, Australia, India, and China also say they're starting to see hints of these waves.
Read the entire NPR article for an excellent explanation of what is going on and why it is such a big deal.
|
