courses:ast403:extragalactic-distance-scale
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | |||
| courses:ast403:extragalactic-distance-scale [2026/02/12 09:03] – shuvo | courses:ast403:extragalactic-distance-scale [2026/02/12 09:05] (current) – shuvo | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| ===== Extragalactic Distance Scales ===== | ===== Extragalactic Distance Scales ===== | ||
| - | Extragalactic distance determination relies on a **distance ladder** where absolute distances to nearby objects are used to calibrate relative indicators that reach further into the Universe. This calibration is essential to determine the **Hubble constant** ($H_0$), as redshift-based distances are only accurate if $H_0$ is known and peculiar velocities (local gravitational motions) are negligible. | + | Extragalactic distance determination relies on a distance ladder where absolute distances to nearby objects are used to calibrate relative indicators that reach further into the Universe. This calibration is essential to determine the Hubble constant ($H_0$), as redshift-based distances are only accurate if $H_0$ is known and peculiar velocities (local gravitational motions) are negligible. |
| * **Primary Distance Indicators: | * **Primary Distance Indicators: | ||
courses/ast403/extragalactic-distance-scale.1770912209.txt.gz · Last modified: by shuvo