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NASA

Researchers unveiled evidence of hydrogen plumes on Saturn's moon Enceladus that are similar to deep sea hydrothermal vents on Earth that support primitive life. According to Linda Spilker, a Cassini Project scientist at NASA's Jet Propulsion Laboratory:

"The hydrogen is coming from a hydrothermal vent on the seafloor of Enceladus, the hydrogen could be a source of energy for microbes that might be in Enceladus' ocean."

Potential for life on Jupiter's moon Europa, too: Hubble Space Telescope discovered a water plume on the warmest part of Europa's surface.

Why it matters: The most likely locations for life beyond Earth in our solar system may be these two moons.

The discovery of these hydrothermal vents on Enceladus was made by the Cassini spacecraft, which has been in orbit around Saturn for 14 years. It made a dive through one of Enceladus' plumes in 2015 and used a mass spectrometer to analyze the particles in it to gather this evidence.

How it works: Hydrogen would essentially serve as food for any microbes that might be in Enceladus' ocean. As rocks are exposed to warm water, they undergo a process known as "serpentinization," in which certain minerals rich in iron react with the the ocean and new minerals are produced, forming mineral precipitates.

What's next:

  • Enceladus: The Cassini mission is winding down this year, but researchers would like to confirm existence of phosphorous and sulfur and narrow down the pH on Enceladus.
  • Europa: Researchers want to launch a similar dive into its water plume to give Europa the same treatment as Enceladus.

Go deeper

Updated 3 hours ago - Politics & Policy

1 dead after pickup truck hits Pride spectators in Florida

Police investigate the scene where a pickup truck drove into a crowd of people at a Pride parade in Wilton Manors, Florida, on Saturday. Photo: Jason Koerner/Getty Images

A driver in a pickup truck hit spectators at a Pride festival in Wilton Manors, Florida, killing a man and leaving another person hospitalized Saturday, authorities said.

Details: Fort Lauderdale Mayor Dean Trantalis told reporters police had "apprehended the driver" and that the vehicle missed a parade car carrying Rep. Debbie Wasserman Schultz (D-Fla.) "by inches."

Updated 6 hours ago - Sports

Uganda Olympic team member tests positive for COVID in Tokyo

The Uganda National boxing team's Catherine Nanziri (L) and others arrive for check-in at Entebbe international airport in Wakiso, Uganda on Friday, ahead of their departure to participate in the Tokyo Olympic Games. Photo: Badru Katumba/AFP via Getty Images

A Uganda Olympic team member tested positive for COVID-19 upon arrival in Japan late Saturday, officials said.

Why it matters: Japan's government has faced criticism for vowing to host the Tokyo Games next month as coronavirus cases rise. The Ugandan team is the second to arrive in Japan after the Australian women's softball players, and this is the first COVID-19 infection detected among the Olympic athletes, Al Jazeera notes.

Updated 10 hours ago - World

In photos: Brazilians rally against Bolsonaro as COVID deaths top 500,000

A June 19 protest in São Paulo, Brazil, against the administration of Brazilian President Jair Bolsonaro, who has railed against precautionary health measures despite the soaring COVID-19 death rate and cases. Photo: Rodrigo Paiva/Getty Images

Demonstrators took to the streets in at least 22 of Brazil’s 26 states to protest President Jair Bolsonaro's handling of the pandemic — as deaths from COVID-19 in the country surged past 500,000 Saturday, per AP.

The big picture: Brazil has the world's second-highest coronavirus death toll and third-highest number of reported cases. Only 12% of the country's population has been vaccinated against the virus, AP notes.