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

We find ourselves in a universe that appears, at first glance, ripe for life. Liquid water, abundant even in our own solar system (though most of it is hiding underneath thick icy crusts), amino acids hitching rides on comets, simple proteins found in young systems, millions upon millions of stars exactly like our sun in just the Milky Way galaxy.

By all appearances we should not be alone, and yet we don't see a single sign of anybody else, anywhere.

The chances of life appearing in the universe are obviously greater than 0 (otherwise I wouldn't be writing this and you wouldn't be reading this), but seem far, far less than 1.

What Earth got right: We can understand why planets like Mars and Venus wound up dead — too small to sustain a protective magnetic field and choking on its own oppressive atmosphere, respectively — even though they had a decent shot. But we don't fully understand the special sauce that makes life possible. So we're playing a numbers game. How many planets are out there? How many have liquid water? How many have a stable star and the right cocktail for life? It's only by obsessive, detailed observations will we crack it.

The other voices in the conversation:

Go deeper

Updated 1 hour ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 2 p.m. ET: 19,451,097 — Total deaths: 722,835 — Total recoveries — 11,788,665Map.
  2. U.S.: Total confirmed cases as of 2. p.m. ET: 4,968,413 — Total deaths: 161,858 — Total recoveries: 1,623,870 — Total tests: 60,415,558Map.
  3. Public health: Fauci says chances are "not great" that COVID-19 vaccine will be 98% effective.
  4. Science: Indoor air is the next coronavirus frontline.
  5. Schools: How back-to-school is playing out in the South as coronavirus rages on — Princeton, Johns Hopkins, Howard to hold fall classes online.
2 hours ago - World

What's next for Lebanon after the Beirut explosion

Photo: Houssam Shbaro/Anadolu Agency via Getty Images

Beirut residents are still clearing rubble from streets that appear war-torn, days after a blast that shocked the country and horrified the world.

Why it matters: The explosion is likely to accelerate a painful cycle Lebanon was already living through — discontent, economic distress, and emigration.

Wolf Blitzer marks 15 years in "The Situation Room"

Wolf Blitzer on the White House beat in 1993, along with NBC's Brian Williams, CBS' Rita Braver and ABC's Brit Hume. Photo: Paul J. Richards/AFP via Getty Images H

Aug. 8, 2005 — "The Situation Room's" debut on CNN wherein the host first said: "I'm Wolf Blitzer and you're in The Situation Room, where news and information from around the world arrive in one place simultaneously!"

The state of play: When the pandemic took off in the U.S. in March, Blitzer started working 7 days a week for 60+ days, until he took a Sunday off. Then he continued 7 days a week until he took a few days off.