How are galaxies classified? What is the Local Group of galaxies?
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- How do planets form from protoplanetary disks?
- When does the Ursid meteor shower typically occur?
- Where does our Sun fall within the spectral classification system? What is the Hertzsprung-Russell (H-R) diagram?
- What will happen to the Earth when the Sun becomes a red giant? What are some of the potential hazards to Earth from space, such as asteroid impacts?
- What are the different types of galaxies?
- What is the Standard Model of particle physics?
- Are scientists working on a theory of quantum gravity? What is string theory?
- How does the age of the universe compare to the timescale of human history?
- How has the understanding and classification of constellations evolved over time?
- What was the heliocentric model?
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