Linear Model in Cosmology

Less than 100 years ago, the universe appeared to be composed of a single static galaxy, containing perhaps a million stars. Today we have observations of hundreds of billions of galaxies, each with hundreds of billions of stars, all moving.

The beginnings of the modern physical science of cosmology came with the publication in 1929 by Edwin Hubble that included use of a linear model.

In this exercise, you will build a model whose slope will give Hubble's Constant, which describes the velocity of galaxies as a linear function of distance from Earth.

Hubble's Plot

Use the pre-loaded DataFrame with columns names, distances, and velocities.
To model a linear relationship between velocities and distances, use formula="velocities ~ distances".
build and fit a model using ols().fit() with formula="velocities ~ distances" and data=df.
Extract the intercept from model_fit.params and the intercept spread from model_fit.bse.

Take Hint (-30 XP)

Exercise

Linear Model in Cosmology

Instructions