Mars is within 5 degrees of Mercury from Oct. 12 through Oct. 29, but is much fainter. On the evening of Oct. 19, the two planets will appear closest together, just 2 degrees apart. About 30 minutes ...

York University planetary scientist Dr. Charles-Édouard Boukaré discusses molten rocky exoplanets: rocky planets so close to ...

The universe is about 13.8 billion years old. Venus is the hottest planet due to a runaway greenhouse effect. Elliptical galaxies are the most common type. Stars produce energy through nuclear fusion.

I recall as a child lying on the grass at night, gazing up at the stars, and wondering if any of those distant suns had planets orbiting nearby. I was not the first to do so, of course. The question ...

On August 10, six planets—Mercury, Venus, Jupiter, Saturn, Uranus, and Neptune—will line up in an arc in the night sky. Four of these planets—Mercury, Venus, Jupiter, and Saturn—can be seen with the ...

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the discovery of Pluto in the 1930s. Labeled as planet X, prominent astronomers ...

On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...

“The presence of this mineral puts a lot more nuance on what was going on,” said Mario Parente, an associate professor of ...

Two recent studies used seismic data from NASA's retired InSight mission to shed light on what lies beneath Mars’ surface and what that means for the planet’s history ...

In early 2025, the world observed a rare planetary parade event that won't be seen again until 2040. On the last day of February, seven planets appeared to align at the same time, creating a rare ...