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A view of part of the Virgo cluster of galaxies. Photo: NASA/JPL-Caltech/SSC

A team of scientists is embarking on a five-year mission to map 30 million galaxies.

Why it matters: By locating the galaxies in relation to one another, the researchers hope to get closer to answering some of the biggest outstanding questions in astronomy and cosmology today, including how galaxies form and what spurs on the expansion of the universe.

What's happening: The research team is using the DESI instrument on the Kitt Peak National Observatory in Arizona to observe these galaxies.

  • "Using 5,000 robotically controlled optical fibers, DESI can gather spectroscopic data, or light, from 5,000 galaxies at a time," the Center for Astrophysics wrote in a statement.
  • DESI will allow scientists to create a 3D map of the universe that will stretch back 11 billion years.

The big picture: The hope is that DESI will help reveal the unseen forces — dark energy and dark matter — that create the clumps of galaxies we see today.

Go deeper: Ancient spiral galaxy may have formed not long after the Big Bang

Go deeper

Naomi Osaka eliminated from Olympic tennis tournament in Tokyo

Czech 42nd-ranked Marketa Vondrousova (L) shakes hands with Japan's Naomi Osaka after their Tokyo 2020 Olympic Games women's singles third round tennis match at the Ariake Tennis Park in Tokyo on Tuesday. Photo: Giuseppe Cacace/AFP via Getty Images

Tennis superstar Naomi Osaka was eliminated from the Olympics after losing her Tokyo tennis tournament match 6-1, 6-4 in the third round to Czech Marketa Vondrousova on Tuesday.

Of note: Osaka is the women's world No. 2, while is Vondrousova ranked No.42.

Editor's note: This a breaking news story. Please check back for updates.

Drought pushes 2 major U.S. lakes to historic lows

Kayakers at a boat launch ramp Page, Arizona, on July 3, which was made unusable by record low water levels at Lake Powell as the drought continues to worsen near. Photo: David McNew/Getty Images

Two significant U.S. lakes, one of which is a major reservoir, are experiencing historic lows amid a drought that scientists have linked to climate change.

What's happening: Lake Powell, the second largest reservoir in the U.S., has fallen 3,554 feet in elevation, leaving the crucial reservoir on the Colorado River, at 33% capacity — the lowest since it was filled over half a century ago, new U.S. Bureau of Reclamation data shows.

Updated 1 hour ago - World

North and South Korea restart hotline and pledge to improve ties

South Korean President Moon Jae-in and North Korean leader Kim Jong Un in Pyongyang, North Korea, in 2018. Photo: Pyeongyang Press Corps/Pool/Getty Images

North and South Korea's leaders have pledged to improve relations and resume previously suspended communication channels between the two countries.

Why it matters: The resumption of the hotline on Tuesday comes despite stalled negotiations between Washington and Pyongyang on the denuclearization of North Korea, which broke down after a second summit between then-President Trump and North Korean leader Kim Jong-un ended without a deal in 2019.