UNSEEN SKY / ARTICLES

Astrophysics

Stars, black holes, cosmology and the physics of the universe.

5 STORIES

ESO visible-light image showing the glowing rings of the Helix Nebula, NGC 7293.

OBSERVATIONS · November 2, 2026

Helix Nebula: A Glimpse of the Sun's Fate

Hubble Space Telescope image of interstellar comet 3I/ATLAS surrounded by a blue-tinted coma, with streaked background stars.

DISCOVERIES · November 2, 2026

3I/ATLAS: Older Than the Sun?

NASA simulation of a supermassive black hole showing gravitational lensing and a glowing accretion disk

ASTROPHYSICS · October 31, 2026

You Could Fall Into a Black Hole and Not Even Notice

The Moon completely covering the Sun during a total solar eclipse, revealing the solar corona

SOLAR SYSTEM · October 31, 2026

One Day, Earth Will Have Its Last Total Solar Eclipse

NASA Solar Dynamics Observatory image revealing the Sun's glowing plasma and magnetic activity

ASTROPHYSICS · October 31, 2026

The Sun Is Not on Fire. So What Makes It Shine?