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Brazil Energy Authorities Approve Returning to Daylight Saving Time as Drought Bites 

A man rides a boat in front of the sandbanks at the Solimoes River, one of the largest tributaries of the Amazon River, during a Greenpeace flyover to inspect what the National Center for Monitoring and Early Warning of Natural Disasters (Cemaden) says is the most intense and widespread drought Brazil has experienced since records began in 1950, near Tefe, Amazonas state, Brazil September 17, 2024. (Reuters)
A man rides a boat in front of the sandbanks at the Solimoes River, one of the largest tributaries of the Amazon River, during a Greenpeace flyover to inspect what the National Center for Monitoring and Early Warning of Natural Disasters (Cemaden) says is the most intense and widespread drought Brazil has experienced since records began in 1950, near Tefe, Amazonas state, Brazil September 17, 2024. (Reuters)
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Brazil Energy Authorities Approve Returning to Daylight Saving Time as Drought Bites 

A man rides a boat in front of the sandbanks at the Solimoes River, one of the largest tributaries of the Amazon River, during a Greenpeace flyover to inspect what the National Center for Monitoring and Early Warning of Natural Disasters (Cemaden) says is the most intense and widespread drought Brazil has experienced since records began in 1950, near Tefe, Amazonas state, Brazil September 17, 2024. (Reuters)
A man rides a boat in front of the sandbanks at the Solimoes River, one of the largest tributaries of the Amazon River, during a Greenpeace flyover to inspect what the National Center for Monitoring and Early Warning of Natural Disasters (Cemaden) says is the most intense and widespread drought Brazil has experienced since records began in 1950, near Tefe, Amazonas state, Brazil September 17, 2024. (Reuters)

Brazilian energy authorities have approved bringing back daylight saving time, a senior official said on Thursday, to save energy as the country faces a major drought that has hit power generation.

Before it goes into effect, reinstating daylight savings time will need to be backed by President Luiz Inacio Lula da Silva.

A prolonged drought in Brazil has affected some of the country's largest hydroelectric plants, including two fed by an Amazonian river, forcing a shift to more energy imports and driving up power bills.

Despite the growth of wind and solar power in Latin America's largest economy, more than half its electricity still comes from harnessing the power of rivers and lakes.

Reservoir levels near major hydroelectric plants in key southeastern and center-west areas are expected to end September at below 50%, as the region's rainfall drops to less than half of normal levels.

By moving clocks forward an hour between November and February, daylight saving time would make use of more daylight hours and ease pressure on peak power consumption in the late afternoon when solar plants stop generating as the sun sets.

Former President Jair Bolsonaro abolished daylight savings in 2019, arguing it was no longer benefiting the power sector.

Mines and Energy Minister Alexandre Silveira told reporters on Thursday that national grid operator ONS recommended bringing back daylight savings time and an energy committee representing energy entities approved the potential move.

But the minister also expressed some doubts, saying he wanted to evaluate alternatives, even though earlier this week he appeared to signal his support for bringing back daylight savings time, describing it as "a very pressing reality."

Some sectors cheered the possible switch to the previous policy.

Restaurants back the move, as local association Abrasel estimates the extra hour of daylight would help increase clients from 6-8 p.m. and boost monthly revenue by at least 10%.

Moving clocks forward by one hour, however, would complicate airline flight schedules while incurring additional costs to relocate crews.

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Varieties

Astronomers Trace the Origin of Meteorites that Have Struck Earth

Reporters gather around a piece of a meteorite, which according to local authorities and scientists was lifted from the bottom of the Chebarkul Lake, placed on display in a local museum in Chelyabinsk, October 18, 2013. REUTERS/Andrey Tkachenko/File Photo
Reporters gather around a piece of a meteorite, which according to local authorities and scientists was lifted from the bottom of the Chebarkul Lake, placed on display in a local museum in Chelyabinsk, October 18, 2013. REUTERS/Andrey Tkachenko/File Photo
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Astronomers Trace the Origin of Meteorites that Have Struck Earth

Reporters gather around a piece of a meteorite, which according to local authorities and scientists was lifted from the bottom of the Chebarkul Lake, placed on display in a local museum in Chelyabinsk, October 18, 2013. REUTERS/Andrey Tkachenko/File Photo
Reporters gather around a piece of a meteorite, which according to local authorities and scientists was lifted from the bottom of the Chebarkul Lake, placed on display in a local museum in Chelyabinsk, October 18, 2013. REUTERS/Andrey Tkachenko/File Photo

Meteorites - rocks that fall to Earth from space - have pelted our planet from its birth about 4.5 billion years ago to today, often causing scant damage but sometimes triggering cataclysms. But from where exactly are these space rocks coming? New research has the answer, according to Reuters.

By studying the composition of meteorites that have landed over the years and the asteroids populating our solar system, astronomers have determined that about 70% of known meteorite impacts came from just three groups of asteroids residing in our solar system's main asteroid belt between Mars and Jupiter.

In total, the researchers in three different studies have now been able to account for the origins of most of the tens of thousands of known meteorites that have landed on Earth.

As part of the research, the astronomers carried out numerical simulations that enabled them to model the formation and evolution of families of asteroids orbiting the sun in the main asteroid belt.

"It is a group of asteroids which have similar orbits because they were fragments created during a collision between two asteroids," said astronomer Miroslav Brož of Charles University in Prague, lead author of two of the studies, published in the journal Nature, and Astronomy and Astrophysics.

Collisions in the main asteroid belt send rocky fragments flying haphazardly through space, with some of those eventually striking Earth.

"While more than 70,000 meteorites are known, only 6% had been clearly identified by their composition as coming from the moon, Mars, or Vesta, one of the largest asteroids in the main asteroid belt. The source of the other meteorites had remained unidentified," said astronomer Michaël Marsset of the European Southern Observatory in Chile, lead author of one of the two studies published in the journal Nature.

The Massalia asteroid family, formed about 40 million years ago, accounts for a class of meteorites called L chondrites that represent 37% of known Earth meteorites, the research found. The Karin family, formed 5.8 million years ago, and the Koronis family, formed 7.6 million years ago, account for a class of meteorites called H chondrites that represent 33% of known Earth meteorites, it showed.

Another 8% of the Earth meteorites can be traced to the Flora and Nysa asteroid families in the main asteroid belt, the research found. And about 6% of the meteorites can be traced to Vesta, it showed. Previous research found that less than 1% of the meteorites came from Mars and the moon.

The researchers are still exploring the source of the remaining roughly 15% of known Earth meteorites.

Space rocks have played a role in shaping the direction of life on Earth.

The new research did not look at the source of the one that struck Earth 66 million years ago that wiped out the dinosaurs, aside from their bird descendants, and enabled mammals to become dominant. Another study published in August found that this object formed beyond Jupiter and probably migrated inward to become part of the main asteroid belt before being sent hurtling toward Earth, perhaps due to a collision.

As the dinosaur-killing impact showed, a large space rock can pose a mortal threat to life on Earth. In 2022, NASA's DART spacecraft slammed into the asteroid Dimorphos in a proof-of-principle planetary defense mission that showed that a spacecraft can change a celestial object's trajectory just enough to keep Earth safe.

Some of the meteorites that have landed on Earth can give clues about the solar system's early history. They are primordial leftovers from a time before the planets formed in a large disk of material - called the protoplanetary disk - swirling around the newborn sun.

"Chondrites are primitive meteorites that have mostly preserved their original composition since their formation in our protoplanetary disk," Marsset said.