Cosmology

宇宙學，天文學，暗能量，宇宙年齡，太陽系，星座

Free application

Cosmologists puzzle over exotic concepts like string theory, dark matter and dark energy and whether there is one universe or many (sometimes called the multiverse). While other aspects astronomy deal with individual objects and phenomena or collections of objects, cosmology spans the entire universe from birth to death, with a wealth of mysteries at every stage

The appendix contains a description of physical cosmology.

What Is Cosmology? Definition & History

The Expanding Universe

Cepheid Variables

Redshift and Recessional Velocity

Redshift vs. Kinematic Doppler Shift

Cosmological Metric & Expansion

Robertson-Walker Metric

Hubble Parameter & Scale Factor

Robertson-Walker Metric

Hubble Parameter & Scale Factor

Friedmann Equation & World Models

Fluid Equation

Matter Dominated Universe

Radiation Dominated Universe

Dark Energy

Spiral Galaxy Rotation Curves

Velocity Dispersion Measurements of Galaxies

Hubble & Density Parameter

Age of Universe

Angular Diameter Distance

Luminosity Distance

Type 1A Supernovae

Cosmic Microwave Background

CMB - Temperature at Decoupling

Anisotropy of CMB Radiation & Cobe

Modelling the CMB Anisotropies

Horizon Length at the Surface of Last Scattering

Extrasolar Planet Detection

Astronomy

Astronaut

Scientist

Solar System

Constellation