Is the Universe Infinite?
The surface of the Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, good ol’ Earth helps u...
Space Science Articles
Explore the cosmos through in-depth articles about astronomy, astrophysics, and space exploration
New Research Suggest Earth and Theia were Neighbors Before They Collided
According to the leading theory of how the Earth-Moon system formed (the Giant Impact Hypothesis ), a Mars-sized object (named Theia) collided with a ...
Seeing an Interstellar Comet Through Martian Eyes
Interstellar objects are really rather rare. Since astronomers first spotted 'Oumuamua racing through our Solar System in 2017, we've detected only tw...
The Man in the Moon Gets a New Scar
I have to confess, despite spending years gazing at the night sky, telescope at the ready, tracking planets and hunting for deep sky objects, I only a...
Tracking Mars' Ice Ages From Space
Human beings are pretty familiar with the concept of "ice ages." Not only is their ample physical evidence to suggest that glacial periods occurred du...
DESI's Dizzying Results
In March of 2024 the DESI collaboration dropped a bombshell on the cosmological community: slim but significant evidence that dark energy might be get...
We've Long Thought The Surface Area Of A Black Hole Can't Decrease. Now We Have Data To Back It Up.
Hawking radiation has never been proved, but it's generally thought to be real. Essentially, the argument is that when you combine black hole event ho...
The JWST Makes Some Headway Understanding Little Red Dots
One of the things the James Webb Space Telescope revealed to us is a class of small, distant galaxies in the very early Universe. Their light has been...
Asteroid 2024 YR4 Was Earth's First Real-Life Defense Test
At this point in history, astronomers and engineers who grew up watching Deep Impact and Armageddon, two movies about the destructive power of asteroi...
How Dark Energy Changed Cosmology Forever
Let’s rewind the clock back…oh, I don’t know, let’s say a hundred years. It was 1917, and Einstein had just developed his general theory of relativity...
How Three Runaway Stars Solved A Galactic Mystery
All motion is relative. That simple fact makes tracking the motion of distant objects outside our galaxy particularly challenging. For example, there ...
The Andromeda Galaxy Quenches Its Satellite Galaxies Long Before They Fall In
Astronomers know that mergers play a huge role in galaxy growth. Right now, the Milky Way is slowly consuming the Large and Small Magellanic Clouds. T...