The scientific community doesn’t all agree on the core causes of climate change, and according to climate expert Willie Soon, humanity should look beyond Earth to find the source.

The Earth’s rotation around the sun affects the planet’s temperature, says Soon, a visiting fellow on the Science Advisory Committee of the Center for Energy, Climate, and Environment at The Heritage Foundation. (The Daily Signal is the news outlet of The Heritage Foundation.)

Glaciers, for example, “melted away because the sun started to get … brighter and provided more solar energy to the climate system,” according to Soon.

Throughout his career, Soon, a former researcher with the Center for Astrophysics-Harvard & Smithsonian, says he has sought to pursue the facts surrounding shifts in the climate because “science is not about belief.”

“Science is about data,” he said.