Small Bodies of the Solar System - Professor Carolin Crawford

TL;DR

This lecture discusses asteroids and dwarf planets in the solar system, their characteristics, and their significance in understanding the formation of the solar system.

Transcript

good afternoon everyone so this is my penultimate Grusha lecture and I chosen a very topical subject which is the smaller objects of the solar system we all know lots about the major planets they tend to get lots of the publicity but as you'll discover this is the year of the dwarf planet and I'm going to use that as an excuse to talk a bit more ab... Read More

Key Insights

• 🛩️ Asteroids are small rocky objects in the solar system, while dwarf planets are larger rocky objects that have not cleared their own orbital paths.
• 💁 The asteroids in the asteroid belt and the dwarf planets provide valuable information about the formation of the solar system.
• 🪐 The discovery of asteroids and dwarf planets expanded our understanding of the solar system beyond the major planets.

Questions & Answers

Q: What are asteroids made of and how do their sizes vary?

Asteroids are made of rock, with contributions of metal and ice. Sizes of asteroids range from tens of meters to hundreds of kilometers in diameter.

Q: Why are dwarf planets not classified as major planets?

Dwarf planets have not cleared their own orbital path around the sun like major planets have. They are also smaller in size compared to major planets.

Q: Why was there confusion and debate about the status of Pluto as a planet?

The discovery of other large objects like Eris in the Kuiper Belt raised questions about the classification of Pluto as a major planet. Eventually, the International Astronomical Union redefined the criteria for a planet, and Pluto was reclassified as a dwarf planet.

Q: What can we learn from studying asteroids and dwarf planets?

Studying these smaller objects provides insights into the formation of the solar system and the processes that occurred billions of years ago. They also offer a potential source of valuable resources in the future.

Summary & Key Takeaways

• Asteroids are lumps of space rock ranging in size from tens of meters to hundreds of kilometers. They are made of rock, with contributions of metal and ice depending on their location in the solar system.

• Dwarf planets are similar to asteroids but larger, ranging from hundreds to thousands of kilometers in size. They are not classified as major planets because they have not cleared their own orbital path around the sun.

• Astronomers used to only focus on major planets, but the discovery of new objects like Uranus and asteroids in the 18th and 19th centuries shifted the paradigm of astronomy.

• The asteroid belt is a region between Mars and Jupiter where most asteroids are located. The Kuiper Belt is a region beyond Neptune where dwarf planets and other icy objects are found.