Two comets whiz past Earth this week — here’s how to see the cosmic twofer

After a year devoid of comets visible to the naked eye, two of the celestial entities — C/2025 A4 (Lemmon) and C/2025 R2 ...

Space exploration in the backyard, on a budget – how NASA simulates conditions in space without blasting off

A planetary scientist who has participated in analog missions describes their value for planning space exploration – and ...