A "Full Ship Shock Trial" conducted by a Navy aircraft carrier in June included an experimental explosion that also registered at magnitude 3.9.
Since being tagged in Canadian waters in 2020, the 13-foot-long shark has traveled thousands of miles.
The fifth named storm of the Atlantic hurricane season is expected to strengthen as it buffets the Caribbean islands and moves westward.
After traveling through the Carolinas on Monday morning, Tropical Storm Claudette is expected to head out to the Atlantic Ocean and travel to Nova Scotia on Tuesday.
Iran's state TV reported an Iranian destroyer and support vessel are sailing in the Atlantic Ocean without revealing its final destination. Its cargo is suspected to end up in Venezuela.
The basking shark is the second-largest fish in the ocean, which can grow up to 39 feet long and weigh six tons.
A man faces a $5,000 fine for illegal possession with intent to sell after keeping seven sharks in an above-ground pool inside his home.
A large-tusked walrus was spotted on the shore of Valentia Island in Co. Kerry, Ireland—and was a rare sight for the region.
The death of the animal is the latest case in what officials have called an "Unusual Mortality Event" that has been ongoing among North Atlantic right whales since 2017.
The shark, known as Unama'ki, has traveled more than 12,500 miles since being tagged in September, 2019.
The shark is estimated to be around 50 years old and was tagged just off the coast of Nova Scotia, Canada.
In the past 24 hours, the storm has increased its windspeed by about 55 miles per hour.
Seismic blasting produces one of the loudest sounds in the ocean, and can damage marine creatures' hearing and disrupt their feeding behaviors and communications.
Tropical Storm Teddy is "likely to cause life-threatening surf and rip current conditions," the National Hurricane Center warned.
"La Niña" is a periodic climate pattern characterized by cooling of the sea surface in some parts of the Pacific Ocean.
As of September 9, there have been 17 named storms in the Atlantic Basin.
The image, showing an up-close glimpse of the apex predator swimming through clear water, was published to Twitter by the Atlantic White Shark Conservancy this week.
The two tropical systems that are expected to enter the Gulf next week both formed on Thursday in the Atlantic Basin.
The hurricane that's packing life-threatening rain and flooding now is projected to work its way north and east along the U.S. coast, approaching Virginia, D.C., Baltimore, Philadelphia, New York City and Boston.
Although all storms are similar, their designations indicate the different wind speeds they have.
"2020 is set up to be a dangerous year for fires in the Amazon," NASA scientist Doug Morton said.
Trade winds blow dust from the Sahara westwards over the Atlantic every year.
The dust has brought hazy skies and poor air quality to large parts of the Caribbean.
Scientists think these layers of dust in the atmosphere may help to suppress the development of hurricanes.
NASA astronauts Robert Behnken and Doug Hurley are scheduled to take off at 4:30 p.m. ET.
Scientists from Denmark were studying a king penguin colony to assess its impact on greenhouse gas emissions.
Social distancing will force authorities along the south and east coast to rethink how they manage people who must evacuate their homes in the event of a disaster.
The rocket segment is the largest piece of space debris to make an uncontrolled descent back to Earth since 1991.
The mature female began moving away from the U.S. east coast at the start of April.