Theia
The Giant Planets Migrated Between 60-100 Million Years After the Solar System Formed
Untangling what happened in our Solar System tens or hundreds of millions of years ago is challenging. Millions of objects…
What's the Earliest the Moon Could Have Formed?
Astronomers are pretty sure they know where the Moon came from. In the early Solar System, a Mars-sized object dubbed…
Earth is Hiding Another Planet Deep Inside
Earth's early history is marked by massive collisions with other objects, including planetesimals. One of the defining events in our…
Lunar Rocks Have Earth's Noble Gases Trapped Inside. More Evidence That the Moon Came From the Earth
Piecing together the history of the Solar System from the traces left behind isn’t easy. Bit by bit, however, we’re…
The Early Solar System was Messier and More Violent Than Previously Believed
Our conventional models of planet formation may have to be updated, according to a pair of new papers. Accretion is…
The Moon Might Have Formed a Little Later than Originally Believed
A new study indicates that the Moon is actually younger than we thought, and wasn't finished forming until the Earth's…
The Moon Might Be More Metal-Rich Than We Thought
A new study shows that the Moon is more metal-rich than previously thought. That has some far-reaching implications for our…
Do We Now Understand Why the Moon’s Near and Far Sides Look So Dramatically Different?
The Moon is easily the most well-studied object in the Solar System, (other than Earth, of course.) But it still…
New Study Shows the Earth and Moon are not so Similar After All
A new study shows that Earth and the Moon are not as similar as we thought, which helps resolve a…
The Moon is Older Than Scientists Thought
The most comprehensive and widely-held theory of how the Moon formed is called the 'giant impact hypothesis.' That hypothesis shows…