Trees vs. Stars: A Cosmic Comparison
There are more trees on Earth than there are stars in the Milky Way. But this surprising fact only holds true within our own galaxy.
A landmark study published in Nature in 2015 shook the scientific community by estimating the global number of trees at approximately 3.04 trillion. This figure, derived from satellite imagery and over 400,000 ground-based measurements, is about ten times higher than previous estimates.
For context, the Milky Way galaxy is believed to host between 100 and 400 billion stars. The wide range in star counts is due to the difficulty of detecting faint, low-mass red dwarfs.
A Cosmic Perspective
While Earth's 3 trillion trees outnumber the Milky Way's stars, the competition ends at the galactic scale.
The observable universe is estimated to contain up to a septillion stars—a number that dwarfs Earth's trees by an incomprehensible margin.
A Troubling Trend
The same 2015 study revealed a sobering reality about our planet's forests:
- Earth has lost approximately 46 percent of its trees since the dawn of human civilization.
- More than 15 billion trees are cut down each year.
It is important to note that both the tree and star figures are estimates, not exact counts. Both carry inherent uncertainties due to the immense scales and challenges involved in measuring them.