This Week in Astronomy with Dave Eicher: Globular cluster M4

There’s a wonderful sphere of stars visible at this time of year.
By | Published: July 14, 2025

Globular cluster M4 in the constellation Scorpius is a wonderful object to look at through a telescope of any size. Credit: Gerald Rhemann

Key Takeaways:

  • M4 is a globular star cluster in the Scorpius constellation.
  • Antares, Scorpius' brightest star, helps locate M4.
  • M4 is visible to the naked eye, but a telescope shows more detail.
  • Good luck!
Key takeaways sponsored by The Space Store
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In this episode, 
Astronomy
 magazine Editor Dave Eicher invites you to head out and observe M4, the wonderful globular cluster in the constellation Scorpius the Scorpion. You can use the Scorpion’s brightest star, 1st-magnitude Antares, as your guide. Although sharp-eyed observers may pick this up with their naked eyes, its swarms of stars look best through a telescope. Good luck!

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