Chapter 1
The cosmic speedometer
Chapter 2
The oldest baby picture
Chapter 3
Weighing the dark side
Chapter 4
The soundtrack of space
YOUR GOAL
Master of How to weigh the universe
Ch 1 · The cosmic speedometer
infamousd The spiral Milky Way galaxy speeds through space as our Solar System orbits.
isis10 CMB Dipole Anisotropy
We're cruising through the oldest light, flying hundreds of kilometers a second.
isis10 Matching galaxy distances with redshifts formulated Hubble's Law, v = H0 * d, proving that farther galaxies recede
isis10 A glowing cosmic rainbow stretches into long red wavelengths across a dark screen.
BETA
isis10 Spin the cosmic speedometer to learn how math measures the expansion of the early universe.
Fun Fact
Cosmic sirens: Light stretches to red as space expands, making distant galaxies look redder than they actually are.
Quiz
What happens to the wavelength of light from a galaxy that is moving away from Earth?
Quiz
Which Belgian priest and physicist mathematically proposed the expanding universe theory in 1927?
Quiz
What celestial objects did Henrietta Swan Leavitt study to establish the first cosmic distance ladder?
Quiz
What physical phenomenon causes a passing siren's pitch to drop, which is mathematically similar to light redshift?
Quiz
What did Albert Einstein initially add to his equations to force the universe to mathematically stand still?