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Our Expert Voices conversation about the 2017 solar eclipse.

One big question scientists still have about the Sun is why its corona, the outer atmosphere, is so hot — millions of degrees — while the surface below is only thousands! Eclipses provide unique opportunities to get higher quality and speed images than are normally available, either from space or from the ground. During the total eclipse, we're using telescopes mounted on the noses of NASA's WB-57 research jets to observe the solar corona. By observing waves in it and measuring their direction, size, and speed, we hope to better understand how energy is transported up into the corona. With two jets flying at 50,000 feet, we'll get 7-and-a-half minutes of totality compared to only 2-and-a-half on the ground.

What it means: Studying how the corona is formed and how it evolves will lead to better understanding "space weather" hazards like flares and coronal mass ejections that can impact Earth and damage satellites, interrupt GPS and radio, and knock out power grids.

Other voices in the conversation:

Go deeper

Danger lurks in the Democrats' police talk

House Speaker Nancy Pelosi and House Democrats celebrate last June after they passed the George Floyd Policing Act. Photo: Ting Shen/Xinhua via Getty Images

As Congress forges ahead with police reform legislation, Democratic operatives are warning lawmakers to steer clear of any defund-the-police rhetoric since it could hurt them in the midterms.

Why it matters: President Biden and his fellow Democrats say Congress needs to pass the George Floyd Policing Act, which would ban chokeholds, prohibit no-knock warrants and generally make it easier to hold officers accountable for misconduct.

Exclusive: Harris meets Guatemalan president Monday, travels in June

Photo: Jim Watson/AFP via Getty Images

Vice President Kamala Harris will meet virtually Monday with Guatemalan President Alejandro Giammattei to discuss solutions to the surge of migration, and she'll visit the region in June, a senior White House official told Axios.

Why it matters: The administration is taking a multi-pronged approach to solving the problem and also hopes to announce details about its plan for investing aid in Central America on Monday — although a final dollar amount has yet to be decided.

Scoop: Government pays for some sponsors to pick up migrant kids

MIgrant minors play soccer at a holding facility in Donna, Texas. Photo: Dario Lopez-Mills/AFP via Getty Images

The federal government has been paying travel costs for adult sponsors trying to get to shelters to pick up migrant children, a Department of Health and Human Services agency spokesperson confirmed to Axios.

Why it matters: Officials would not provide numbers, but the policy shift underscores the urgency the Biden administration feels to quickly release kids who crossed the U.S.-Mexico border alone and remain in HHS custody.