Articles from the core.

What’s measured at the center of the Milky Way, what’s still open, and what it means for leaving Earth. Every source is cited. Every hypothesis is labeled Theory.

Featured

• ARTICLE 01

  Sagittarius A*: what we actually know

  About 27,000 light-years from here, at the center of the Milky Way, something heavy is sitting in the dark.

• ARTICLE 02

  Open mysteries at the core

  The last article covered what's measured about Sagittarius A*. This one is about where the measurements stop.

• ARTICLE 03

  The light-speed thesis

  Here is the idea behind this whole series, stated plainly.

• ARTICLE 08

  What It Costs to Reach Mars

  Stand on a cold desert night and find Mars: a steady rust-colored point, never more than a few arc-minutes wide. Everything that separates you from it can be written as a bill. The…

Mars & the mind

• ARTICLE 05

  The Psychology of Leaving Home — Why Mars Starts in the Mind Before the Rocket

  The hardest part of going to Mars may not be the propulsion. Or the radiation. Or the landing.

• ARTICLE 06

  Moving Humanity Towards Life Away From Earth — What 'Away' Really Costs, and What It Gives

  "Away" sounds simple.