Harvard and Smithsonian (CfA), and its Submillimeter Array (SMA), were critical for identifying a cache of belts surrounding other stars beyond the sun where comets may reside. Regions around 74 stars ...

Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in February.

For the first time, astronomers have imaged dozens of belts around nearby stars where comets and tiny pebbles within them are ...

Four planets will be widely visible to the naked eye through part of February, but calling them a 'planetary alignment' may not be the full picture.

The Einstein ring, formed as light from a distant galaxy bends to glow around another object in the foreground, could help ...

Five of the brightest planets Mercury, Venus, Mars, Jupiter, and Saturn, can be seen even from urban areas with mild ...