Collecting Samples with Perseverance: Justin Simon, NASA

TL;DR

NASA scientist Justin Simon explains the methods and techniques used to determine the ages of rocks on Earth and in the solar system, emphasizing the importance of sample collection from Mars.

Transcript

and um we are going live okay in theory we should be live um hey everyone welcome for to another live interview here on my universetoday channel uh this week i'm pleased to bring on a special guest to talk about sampling the solar system talking with justin simon from nasa justin welcome to the show thank you it's a pleasure so the question i alway... Read More

Key Insights

• 🤕 Multiple techniques, based on chemistry and isotopic systems, allow scientists to determine the age and history of rocks from Earth and the solar system.
• 🤕 By combining different tools and observations, scientists can confidently determine the ages of rocks and their relationships to other geologic features.
• 🤕 The study of meteorites provides valuable insights into the formation and histories of rocks from the solar system, helping scientists understand the early ages of our celestial neighborhood.
• ♻️ Sampling the diverse environments of Mars will enable scientists to identify habitable environments, study their chemical compositions, and potentially uncover evidence of past life.

Questions & Answers

Q: How do scientists determine the relative ages of rocks?

Relative age determination involves observing the order of rock layers and evaluating what is on top, outside, below, or inside a specific geologic feature. The older rocks are usually found at the bottom, while the younger rocks are on top.

Q: What laboratory techniques are used to determine the absolute ages of rocks?

Scientists use various techniques, such as uranium-lead and uranium-thorium-lead systems, as well as the argon-argon system. By analyzing the decay of radioactive elements, scientists can determine the absolute ages of rocks.

Q: Can scientists determine the entire history of a rock, including its earlier lives?

In most cases, scientists can extract some vestige of a rock's history, including its earlier lives. However, in certain cases where rocks are heavily metamorphosed or disturbed, it may be challenging to determine their complete history.

Q: How do scientists use these techniques to date samples from the solar system, such as meteorites?

Scientists use uranium-lead and argon-argon systems to determine the ages of meteorites. By analyzing the radioactive decay of elements, they can understand the absolute age of meteorites and unravel their formation, reheating, deformation, and alteration histories.

Summary & Key Takeaways

• Justin Simon, a NASA scientist, leads a group of scientists who analyze rocks from outer space and extraterrestrial materials to understand their formation processes using geologic and geochemical constraints.

• There are two methods to determine the age of rocks: relative time, which evaluates the order of rock layers, and absolute time, which uses laboratory-based techniques involving radioactive decay and isotopic systems.

• Multiple tools and techniques, based on chemistry and the behavior of chemical elements, can determine the absolute ages of rocks, providing insights into their formation and alteration histories.