Space
Total Solar Eclipse Offers Rare Chance to Understand the Sun’s Atmosphere
The first total solar eclipse to cross the U.S. from coast to coast in 99 years is not only a must-see spectacle but also a valuable scientific opportunity
Stories by Jay M. Pasachoff
Space
Deuterium in the Universe
All the heavy hydrogen in space may have been made in the first 15 minutes after the "big bang". Observations leading to estimates of its abundance thus provide evidence on conditions at that time...
Space
The Solar Corona
The physical nature of the sun's outer atmosphere is emerging from observations made not only on the ground during eclipses but also from rockets, from satellites and even from the moon
