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

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

According to NASA, four to five planets being visible across the sky at the same time happens only once every few years.

The chances of an asteroid striking Earth within the next decade has doubled in a matter of weeks, according to NASA ...

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.

HH 30 is a luminous region surrounding a newborn star, or protostar. The James Webb Space Telescope helped reveals unprecedented details of it.

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

Our modern era of space observation and exploration deepens our connection with the universe—and with each other. When NASA ...

To get somewhere in outer space, you can’t exactly drive in a straight line. Orbits are tricky things, and sending a probe to ...