It must have sufficient mass to assume hydrostatic equilibrium ... from nitrogen from its atmosphere leaking into the solar wind. Up to 500 tons of nitrogen escape the planet every hour.

The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe. Clyde Tombaugh didn't set out to discover Pluto when he sent his ...

Clyde Tombaugh didn't set out to discover Pluto when he sent his sketches of the night sky to Lowell Observatory in Flagstaff, Arizona in 1929. More than anything, he just wanted to get off the ...

By Katrina Miller Astute skywatchers may have already seen the striking line of planets across the night sky in January. This week Mercury joins the queue. Now every other world in our solar ...

Seven planets are aligning in the night sky this week, creating a brief chance to see a "planetary parade." Worldwide, the best day to see the alignment is today, Feb. 28. Mercury, Venus ...

In case you missed the planetary alignment last month, don't worry — the "planet parade" continues into February, offering skygazers plenty of time to catch a glimpse of the six "aligning" planets.

A planetary parade is in store for the end of February, just over a month since the last one. If you missed January’s spectacle, make sure you tune in to this one. Here’s what you need to ...

Not one, not two, but seven planets are due to line up in the night skies later this week in a relatively rare planetary parade. The phenomenon will see Mars, Jupiter, Mercury, Venus, Saturn ...

For the last month and change, you might've seen the headlines about the planetary alignment, or a planetary parade, going on in our solar system. And that's true. In January 2025, Venus ...

The air pollution from incinerated satellites could also change how much heat the Earth's atmosphere retains, leading to possibly serious consequences on the planet's climate.