The Universe
Learning Objectives
- Students will be able to describe the large-scale structure of the universe
- Students will be able to explain the observable universe and cosmic horizon
- Students will be able to understand Hubble's Law and its implications
Core Concepts
- Observable universe
- Large-scale structure
- Cosmic web
- Hubble sphere
Formulas
$$d = c \cdot t$$
Distance to cosmic horizon from age of universe
$$z = \frac{\Delta\lambda}{\lambda}$$
Redshift measurement from spectral line shift
Units
| Light-year | ly |
Interesting Fact
The observable universe is 93 billion light-years in diameter
Key Scientist
George Lemaitre
Developed theoretical cosmology explaining universal expansion
Ancient Wisdom
The observable universe is vast in scale, containing trillions of galaxies, each with billions of stars. This immense scale can inspire a sense of wonder and awe. However, the scientific understanding of the universe is based on empirical evidence and testable theories, not on spiritual beliefs.
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