Rebecca Zisser / Axios

There are rumors within the astronomical community that LIGO, the super-advanced gravitational wave observatory, may have spotted the signature of two neutron stars colliding.

What they are: Neutron stars are the collapsed cores of massive stars, and are some of the most exotic objects in the universe. They can form in pairs that eventually collide and release massive amounts of energy. Those collisions also create subtle ripples in gravity that might have been detected by LIGO.

What's new: This specific event was seen with traditional telescopes, but it's the first time the same collision may have been detected from radiation and gravitational waves. The LIGO team is checking the validity of their results.

Why it matters: Much of our universe is hidden from us, and gravitational waves give us access to mysterious events. Vibrations from neutron star mergers, for example, can help us understand the origin of the universe's heaviest elements. Spacetime itself is ringing like a bell — we just need to listen.

Go deeper

3 hours ago - Health

15 states broke single-day coronavirus records this week

Data: Compiled from state health departments by Axios; Map: Danielle Alberti/Axios

At least 15 states broke their single-day novel coronavirus infection records this week, according to state health department data reviewed by Axios.

The big picture: The number of coronavirus cases increased in the vast majority of states over the last week, and decreased in only two states plus the District of Columbia, Axios' Andrew Withershoop and Caitlin Owens report.

Updated 4 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Global: Total confirmed cases as of 3 p.m. ET: 11,143,945 — Total deaths: 527,681 — Total recoveries — 6,004,593Map.
  2. U.S.: Total confirmed cases as of 3 p.m. ET: 2,818,588 — Total deaths: 129,584 — Total recoveries: 883,561 — Total tested: 34,213,497Map.
  3. States: Photos of America's pandemic July 4 ICU beds in Arizona's hot spot reach near capacity.
  4. Public health: U.S. coronavirus infections hit record highs for 3 straight days.
  5. Politics: Trump extends PPP application deadlineKimberly Guilfoyle tests positive.
  6. World: Mexican leaders call for tighter border control as infections rise in U.S.
  7. Sports: 31 MLB players test positive as workouts resume.
  8. 1 📽 thing: Drive-in movie theaters are making a comeback.
4 hours ago - Health

In photos: America celebrates July 4 during global pandemic

Photo: Francine Orr/Los Angeles Times/Getty Images

The U.S. has already celebrated Easter, graduations and so much more during the coronavirus pandemic, and now it can add July 4 to the list.

The state of play: Axios' Stef Kight writes public parades and fireworks displays around much of the country are being canceled to prevent mass gatherings where the virus could spread. Hot-dog contests and concerts will play to empty stands and virtual audiences — all while American pride treads an all-time low.