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Short Summary
Main recommendation: Watch NASA's live stream of the Perseverance rover's landing on Mars, which begins on Thursday, February 18th, and is the basis for this video's "inside story" of the mission. The video explains why Jezero Crater was chosen, what Perseverance is designed to do, and how its autonomous seven-minute landing sequence works.
Key Points
- Jezero Crater, a former lake the size of Lake Tahoe, was chosen because it may hold evidence of past life, since river deltas on Earth are where such evidence is often found.
- The landing target is far more precise than earlier missions (Pathfinder 1997, Phoenix 2008, Curiosity 2012), illustrated with an uncertainty oval shown against Florida for scale.
- Perseverance will cache 43 separate rock core samples for a future mission to return to Earth, where far more advanced instruments can study them.
- The MOXIE instrument tests converting CO2 into oxygen, a capability future human explorers would need for breathing and rocket fuel.
- The Ingenuity mini helicopter will attempt humankind's first powered flight on another planet, a test for future drone scouting and sample collection.
- Because radio signals take about 12 minutes to reach Earth, the spacecraft must perform its entry, descent, and landing autonomously.
Details Worth Noting
- Concrete instructions: No step-by-step instructions for the viewer are given.
- The entry, descent, and landing sequence: aeroshell braking removes about 99% of the energy, a supersonic parachute handles the last 1%, the heat shield is released, the back shell fires rockets, and a sky crane lowers the rover on a 21-foot rope before flying off.
- Speeds cited: the spacecraft travels about 48,144 mph during cruise, and about 13,000 mph at atmospheric entry, slowing to about 200 mph under the parachute, and touches down at about 3 mph.
- Perseverance carries 19 cameras, laser, X-ray, and radar capabilities, and a nuclear-powered battery system (while landing footage will come from 23 cameras and two microphones), and it is described as the most complex thing humans have built and sent to another planet.
- Historically, only about half of Mars landing attempts have succeeded, according to the speaker.
Bottom Line
Perseverance's landing is a high-stakes, fully autonomous engineering feat that also sets up future sample return and human exploration, and the livestream is the best way to follow it.
