6.8-magnitude earthquake in South Pacific

Powerful earthquake in the S. Pacific last night. No Pacific-wide tsunami warning, and only a small tsunami wave at Easter Island. No injuries or damages.

Video: Gulf of Mexico jellyfish swarms

Jellyfish swarms in the Gulf of Mexico can be 100 miles (160 km) long. At their thickest, there can be more jellyfish than there is water.

Video: Amazing energy facts

Watch a fun new video from the asapSCIENCE guys.

Join EarthSky’s Deborah Byrd at online viewing of total lunar eclipse

Slooh.com invites stargazers worldwide for an online viewing of the total eclipse of the moon on October 8. Deborah Byrd will be on hand as a special guest.

AIDS pandemic origin was 1920s Kinshasa, says study

Between the 1920s and 1950s, a perfect storm of population growth, sex and railway links let HIV to spread from Kinshasa in Africa, across the globe.

Large section of Aral Sea completely dried up for first time in modern history

The Aral Sea - once the fourth largest inland sea in the world - has been shrinking markedly since the 1960s. Now its eastern basin has completely dried.

35,000 walrus come ashore in Alaska

Pacific walrus that can't find sea ice for resting in Arctic waters are coming ashore in record numbers on a beach in northwest Alaska.

Mega flares from a mini star

You've heard of X flares from our sun? This mini star's biggest flare - seen in April, 2014 - was 10,000 times bigger than the biggest known solar X flare.

U.S. and India to collaborate on Earth and Mars missions

Both NASA and the Indian Space Research Organization placed spacecraft in orbit around Mars last month. They'll join forces on an Earth-orbiting mission set for 2020.

Wind and solar energy capacity catching with nuclear power

The Worldwatch Institute quantifies the steady decline of nuclear energy’s share of global power production, and renewable energy's increased share.