Back to Read the Light of the UniverseLesson 9 of 24
VVASTWARD

J03

Read the Light of the UniverseModule 3Motion, Brightness, and Distance
Module 3 / Lesson 9 of 2428 min
Member

Motion Shifts the Spectrum

How can the displacement of known spectral lines reveal motion toward or away from us?

Measure a Doppler shift, preserve its direction, and translate it into radial velocity.

Two versions of a stellar spectrum show the same pattern shifted toward shorter and longer wavelengths.
Vastward artistic reconstruction. The interactive line measurement below provides the quantitative Doppler relation.

Continue with full Academy access

This Lesson belongs to the complete route. Its title and learning question remain visible, while the explanation, lab, and debrief open with Academy membership.

Full Lesson includes
  • Step-by-step bilingual explanation
  • Interactive model or evidence lab
  • Sources, checkpoint, and saved reflection
Continue with GoogleReturn to route map