Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

Derived from the Greek words peri (around) and helios (sun ... "He came up with the first law of planetary motion that states that planets orbit the sun on an ellipse with the sun being the ...

The Sun’s huge gravitational field keeps many other objects – planets, dwarf planets, asteroids and comets – in orbit around it. The Sun and its planets – Mercury, Venus, Earth ...

The alignment of seven planets in the night sky has captivated observers for centuries, inspiring awe and curiosity. This ...

Opinions expressed by Forbes Contributors are their own. Jamie Carter is an award-winning reporter who covers the night sky. Just six light-years from the solar system — in cosmic terms, our ...

While the planets are technically always "aligned" along the same plane in our sky, seeing so many at once is a special ...

The closest one to the sun is Mercury, then it’s Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The eight planets travel around the Sun at different speeds. These lines show us the ...

Let’s tackle the “relative motion” part first. Consider our own familiar Earth, for example. Our planet revolves around the sun once per year. From our point of view, stuck on Earth ...

All the planets in the solar system orbit the sun on the same plane and in the same direction — west to east. That's called prograde motion. Mercury is constantly racing around the sun ...