The Arecibo Observatory was an invaluable tool used to scan the universe for asteroids, planets, radio signals and alien life.

The massive Arecibo Observatory has contributed to many major scientific discoveries over the last 57 years.

The discovery is the latest misstep for a commission that botched the island's primaries in August so badly that a second round of voting was held.

It's unclear how many employees tested positive.

Trump has spent years blasting Puerto Rican officials while opposing spending to rebuild a power grid and other infrastructure that was wiped out by Hurricane Maria in 2017.

The National Hurricane Center said Marco's sustained winds had decreased to 70 miles per hour (110 kph), though it still warned of life-threatening storm surges and dangerous along the U.S. Gulf Coast.

On Thursday while still a tropical storm, Isaias knocked out power, toppled trees and caused widespread flooding and small landslides in the Dominican Republic and Puerto Rico.

The U.S. National Hurricane Center said the storm was expected to move over or near Puerto Rico on Wednesday night before possibly hitting the U.S. mainland by the weekend.

Not a single repair or rebuilding job has been completed under a government program meant to repair and rebuild damaged homes.

The quake hit at a shallow depth of four kilometres near the city of Ponce and the towns of Guanica and Guayanilla, where hundreds of homes were destroyed by a quake in early January.