Mars is famous for being the red planet. With your eye alone you can see the red tinge that sets it apart from other points of light in the night sky. But a new image from the Mars Express orbiter ...

The changes in temperature and vertical structure of the atmosphere are the two main processes that affect the weather on ...

What are smart scopes? And why are they great for astrophotography? EarthSky’s Marcy Curran tells you why she loves them.

An alien radio signal from K2-155 d? Are there any alien civilizations out there? For several decades, scientists have been searching for evidence that they exist. That effort is collectively known as ...

Saturn is the most gasp-inducing planet when viewed through a telescope. And it’s currently providing its best views of 2026 as it reaches its October 4 opposition. Saturn looks starlike to the eye ...

Tyrannosaurids and megaraptors were two types of carnivorous dinosaurs that lived during the Cretaceous Period, 143 to 66 million years ago. T. rex is perhaps the most famous example of a ...

The Komodo dragon ( Varanus komodoensis) is the largest living lizard on Earth. The biggest males can exceed 10 feet (3 ...

LHS 1140b is a potentially rocky exoplanet in its star’s habitable zone. It’s an intriguing target in the search for worlds ...

Solar wind: Solar wind speeds kept easing over the past day, settling back to low, background levels. Bt, Bz and magnetic coupling: The total interplanetary magnetic field (Bt) stayed weak. Meanwhile, ...

You cannot see the 8th planet from our sun, Neptune, with your eyes alone. Here’s how NASA’s Voyager 2 spacecraft — the 1st and only craft ever to visit Neptune — saw it in 1989. Image via NASA. Read ...

Saturn is putting on one of its best shows of the year. The ringed planet is bright, visible all night and perfectly placed for observing. Saturn reached opposition on October 4, when Earth passed ...

Where does the celestial equator intersect your horizon? ALWAYS at points due east and due west. And the equinox sun is on the celestial equator. That’s why the equinox sun rises due east and due west ...