Dark matter: should we be so sure it exists? Here's how philosophy can help.
More than 50 years since astronomers first proposed "dark matter," we have no idea what it is and nobody has directly seen it or produced it in the lab.
SPACE.com invites experts in space exploration, science & technology to provide insightful commentary and informed perspective on news, current events, innovations, big ideas and ongoing research. Expert Voices includes Op-Ed analysis and opinion as well as interesting observations from the field and space exploration efforts around the world.
Related Topics: Expert Voices - Don Lincoln, Expert Voices - Leroy Chiao, Expert Voices - Paul Sutter, Expert Voices - Robert Lawrence Kuhn, Expert Voices - The Kavli Foundation