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Our expert voices conversation on "How to look for alien life."

Earth is our best guide as we look for new forms of life. Our own planet hosts life in amazing complexity, from single-celled organisms to humans.

Asteroids and comets delivered the amino acids that form proteins to Earth over 4 billion years ago. Based on what we know from the evolution of life thereafter, we are looking for a liquid, probably water. We start out searching for places where liquid water is stable, either in the past, as on the surface of Mars, or currently beneath the icy crust on Europa and Enceladus. We then look for life's building block molecules such as amino acids. It took several billion years for complex life to emerge on Earth, so in our solar system we search for microbes, or fossils of simple organisms like algae or bacteria, the earliest forms of life.

Outside of our solar system, the first step is confirming habitability by analyzing extrasolar planet atmospheres, looking for gases like carbon dioxide and methane that are associated with life here. To confirm life, we need to build large enough space-based telescopes to image extrasolar planets, hopefully only a few decades from now.

Given how quickly life evolved here on this planet after conditions had stabilized, I am optimistic that where we have similar conditions, we will find evidence of life — or past life. The hard part may be finding life and not realizing it, if the life forms are very different from those here on Earth.

The other voices in the conversation:

Go deeper

Hope King, author of Closer
Updated 1 hour ago - Economy & Business

Peloton pumps its brakes

Data: FactSet; Chart: Axios Visuals

Peloton’s popularity is falling as swiftly as it shot up.

Why it matters: Not all pandemic habits stick around. Peloton's trajectory over the past two years exemplifies how challenging it's been for companies to gauge shifts in consumer demand — particularly in sectors heavily altered by the pandemic.

Mitch McConnell's remarks on Black voters raise ire

Senate Minority Leader Mitch McConnell during a Capitol Hill news conference earlier this year. Photo: Anna Moneymaker/Getty Images

Senate Minority Leader Mitch McConnell (R-Ky.) has been widely criticized for comments he made this week about Black American voters.

Driving the news: When asked by a reporter Wednesday about concerns among voters of color, McConnell said "the concern is misplaced, because if you look at the statistics, Black American voters are voting in just as high a percentage as Americans."

Updated 2 hours ago - Politics & Policy

Scoop: Trump’s friends worry legal pick for N.Y. case lacks experience

Photo illustration: Sarah Grillo/Axios. Photo: Brandon Bell/Getty Images

Close associates and advisers to Donald Trump tell Axios they're concerned by his decision to use a relatively inexperienced New Jersey attorney, Alina Habba, in his high-stakes legal fight against New York Attorney General Letitia James.

Why it matters: A former president typically has access to the country's most prestigious experts, including lawyers. Trump has turned to the former general counsel for a parking garage company, who works from a small law office near his Bedminster, N.J., country club.