The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Look up in Michigan's night sky later this month to catch a rare seven-planet parade. The planets will appear to line up in the sky as they orbit the sun, known as a planetary alignment or planet ...

Predictions are uncertain, but the solar system may be pushed farther from the galactic core or even ejected entirely from ...

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

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

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

Astronomers may have discovered a scrawny star bolting through the middle of our galaxy with a planet in tow. If confirmed, ...

New research shows that star activity can distort exoplanet measurements, affecting size, temperature, and atmosphere ...

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.

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.