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

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

Canadian astronomers have taken an extraordinary step in understanding how planets are born, using the James Webb Space ...

Here’s what you should know when you go outside to see for yourself: Yes, the planets are indeed lined up across our sky. No, ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – here’s how to spot the celestial show ...

The solar system is portrayed as a dynamic, gossip-fueled family, with each planet offering snide comments about one another, reflecting their unique characteristics and positions. Despite their ...

These embryos, somewhere between small planetesimals and fully formed planets, were abundant during the solar system's formative stages and played a critical role in planetary formation.

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets, a new study suggests.

Look up this week for February’s full snow moon and to catch the last glimpse of a visible parade of planets in the night sky ...

The four planet-strong "planet parade" currently visible to the naked eye in the night sky for a short time after sunset will ...

Mercury is the closest planet to the sun, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Mercury orbits ...