
Two record-breaking freefalls —
Google executive Alan Eustace broke the world altitude record for a parachute jump when he fell 25 miles to Earth in 15 minutes on Friday, according to The New York Times. How does his jump compare with the previous world record set in October 2012 by Felix Baumgartner? Both spent years preparing for the trip. Baumgartner's sponsored journey was well-documented, while Eustace worked in secret with group of technologists. CNN Weather compares their stats and takes a closer look:1. Baumgartner fell faster: The speed of sound is 767 miles per hour. Airliners travel at an average speed of 600 mph, and a typical skydiver falls at about 120 mph depending on weight. Baumgartner became the first person to break the sound barrier without a vehicle by plummeting to Earth at a peak velocity of 843 mph. Wearing a specially designed space suit, Eustace reached a peak velocity of 822 mph.

Two record-breaking freefalls —
2. Temperatures are warmer where Eustace started: It took about two hours for a helium-filled balloon to carry Eustace from a runway in Roswell, New Mexico, to an altitude of 135,890 feet near the top of the stratosphere, where temperatures increase with altitude. From there, he dropped more than 25 miles to Earth. Baumgartner ascended in a pressurized pod to just over 128,000 feet, and took a 24-mile trip back home.

Two record-breaking freefalls —
3. They both broke the sound barrier, but witnesses reported hearing a boom from Eustace: As Eustace descended at peak speeds of 822 mph, witnesses on the ground reported hearing a sonic boom. How did that happen? As an object travels through the air, the air in front of that object is forced around it. The faster an object goes, the tougher it is for air in front of the object to move around it. The sound barrier is reached when an object is moving faster than the air can move around it. When this happens, a shock wave is formed and ripples out away from the object -- much like waves rippling away from where a thrown rock lands in a pond. When the sound wave reaches our ears here on Earth, we hear a boom.


