NASA successfully landed the InSight probe on Mars’ surface on Nov. 26, following a journey that stretched 300 million miles and lasted six months.

“Today, we successfully landed on Mars for the eighth time in human history,” NASA Administrator Jim Bridenstine said, according to the NASA website. “InSight will study the interior of Mars and will teach us valuable science as we prepare to send astronauts to the Moon and later to Mars.”

InSight’s purpose is to study the interior of Mars to help scientists understand how rocky surface planets formed.

This mission also marks another important scientific milestone because, for the first time, CubeSats were sent into deep space. The CubeSats were used to relay information regarding InSight’s entry, descent and landing.

The descent of InSight was the most stressful part of the mission, since InSight had to rapidly slow down from 12,300 mph to 5 mph during what the scientists called the “seven minutes of terror.”

“While most of the country was enjoying Thanksgiving with their family and friends, the InSight team was busy making the final preparations for Monday’s landing. Landing on Mars is difficult and takes a lot of personal sacrifices, such as missing the traditional Thanksgiving, but making InSight successful is well worth the extraordinary effort,” Tom Hoffman, InSight’s project manager, said to CNN.