Donavyn Coffey

Latest articles by Donavyn Coffey

Planting 1 trillion trees is one way to store unwanted carbon.

Could we ever pull enough carbon out of the atmosphere to stop climate change?

By Donavyn Coffey published

Can we harness natural and human-made carbon traps to help us slow climate change?

Climate Change
An artist's impression of the Wolfe Disk, a massive disk galaxy in the early universe.

Why are galaxies different shapes?

By Donavyn Coffey published

Some galaxies are swirling blue disks, others are red spheres or misshapen, clumpy messes or something in between. Why the different configurations?

Galaxies
NASA's Mars rover Curiosity captured this image of a Red Planet sunset on April 15, 2015.

What color is the sunset on other planets?

By Donavyn Coffey published

It depends on whether the planet's atmosphere is predominantly filled with gas or dust particles.

The Sun
Earth in space

What if Earth were a super-Earth?

By Donavyn Coffey published

What would happen if our Earth were much larger than it is now?

Earth