Nasa's Chandra and Xmm-newton Redefine Milky Way's Size

WHO:

NASA - NASA’s Chandra X-ray Observatory is involved in the study of the Milky Way.

European Space Agency - The XMM-Newton space telescope is also involved in the research.

WHAT:

NASA - A new result shows that the outer spiral arms of the Milky Way galaxy may reach wider than previously thought.

Phys.org - The outer arms of the Milky Way have been found to be up to 10% farther away than previously estimated.

Phys.org - The telescopes spotted the aftermath of three bright explosions in the outer spiral arms.

WHERE:

NASA - The study focuses on the Milky Way galaxy.

WHY:

NASA - The findings may lead astronomers to adjust their understanding of the structure of the Milky Way.

HOW:

NASA - The discovery was made by making precise measurements of distances to dust clouds.

Phys.org - The distance to the echoes of the explosions was measured to determine the new distance of the outer arms.

(UPDATED July 1, 2026 23:28 UTC)

NASA's Chandra X-ray Observatory and the European Space Agency's XMM-Newton space telescope have revealed that the outer spiral arms of the Milky Way galaxy may extend up to 10% farther than previously estimated. This groundbreaking study, which focused on precise measurements of distances to dust clouds and the aftermath of three bright explosions, suggests that astronomers may need to rethink their understanding of the Milky Way's structure. The findings could significantly impact future research in our galaxy and beyond.