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The perfect gift for amateur stargazers

Maybe you know someone who can't wait to get a look at the wonders of the night sky. Maybe that person is you. Either way, the Celestron COSMOS FirstScope is the perfect way to get started on a budget. The telescope's lightweight, portable design makes it easy to grab it and go if you're headed out on a camping trip. With a viewing tube just 10" long, it's compact enough to store away during the daytime, or hang out in a junior astronomer's room without taking up too much window space. The 'scope's 76mm aperture lets in plenty of light, so you get bright, clear views of objects deep in space.

Your guide to the heavens

Inspired by the educational TV series COSMOS: A SpaceTime Odyssey, the telescope tube is adorned with a custom, special-edition wrap featuring the COSMOS eye nebula design. It comes packaged with a Cosmic Calendar poster with images from the show, and a free planetarium app for your Apple® or Android™ device. The FirstScope also pays tribute to Galileo Galilei and many of history's most notable astronomers and scientists by displaying their names around the optical tube, so you can begin searching the night sky right away, armed with a little bit of knowledge.

Product Highlights:

  • portable tabletop telescope ideal for deep-sky viewing
  • Dobsonian mount design offers a light, portable setup
  • includes StarPointer finderscope, free planetarium app, and Cosmic Calendar poster
  • spherical mirror with 76mm aperture provides sharp, detailed views of the night sky
  • maximum useful magnification: 180X
  • 10mm Kellner eyepiece included
  • 30X maximum magnification with included eyepieces
  • 300mm focal length
  • mirror-based Newtonian reflector design delivers bright images
  • light gathering power 118X that of the human eye
  • 10" optical tube is easy to transport and store
  • weight: 4.3 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee

Celestron COSMOS™ FirstScope Reviews

Hands-on research

What's in the box?

Download owner's manual

  • Cosmos FirstScope (with lens cap and eyepiece cap) on tabletop stand
  • 20mm Eyepiece in plastic case
  • 10mm Eyepiece in plastic case
  • StarPointer finderscope
  • Lens cleaning cloth
  • Instruction Manual
  • Cosmos info card
  • Cosmic Calendar poster
  • Product Registration card

Product Research


Overview: The Cosmos FirstScope by Celestron is a portable tabletop telescope for first-time amateur astronomers. It provides a clear, detailed view of the Moon's craters and mountains, as well as some expansive objects such as nebulae, star clusters, and constellations. The telescope comes ready to use with minimal assembly (no tools required). The FirstScope comes with two eyepieces, a StarPointer finderscope, a Cosmic Calendar poster, and a solid rotating base.

StarPointer Finderscope: The telescope comes with a StarPointer red-dot finderscope which mounts to the outside of the unit and helps you aim the telescope at a distant target. The finderscope must first be aligned with the telescope before use.

Kellner Eyepieces: The Cosmos FirstScope features two Kellner eyepieces: a low power 20mm and a high power 10mm. You can choose which eyepiece to use based on the magnification and field of view you desire. It is recommended that you use the 20mm eyepiece when first setting up and aiming the telescope, then switch to the higher power 10mm eyepiece to get a closer look at the object.

Cosmos Celestron Navigator App: To enhance your FirstScope experience, you can download the Cosmos Celestron Navigator App from the iTunes App Store or Google Play. The app has a database of over 120,000 celestial objects, and helps you to locate planets, stars, and galaxies, plus asteroids, comets, and satellites, including the International Space Station. The app can simulate the night sky and create a custom list of visible objects based on your exact time and location. The Cosmos Navigator app is compatible with iPhone, iPad, and iPod touch with iOS 7 or later, as well as Android devices with the Android OS Version 4.0 and up.   

Cosmos: A Spacetime Odyssey: The telescope's graphics are inspired by the TV series Cosmos: A Spacetime Odyssey, which aired in the spring of 2014. The Cosmo series "eye nebula" logo can be found on the tube. A Cosmic Calendar wall poster with images from the TV series is also included.


  • Optical Design: Newtonian Reflector
  • Aperture: 76mm (2.99")
  • Focal Length: 300mm (12")
  • Focal Ratio: f/3.95
  • Eyepiece Focal Length: 10mm and 20mm
  • Eyepiece Magnification: 30x and 15x
  • Highest Useful Magnification: 180x
  • Lowest Useful Magnification: 11x
  • Optical Tube Length: 10"
  • Light Gathering Power: 118x (compared to human eye)
  • Weight (with base): 4.3 pounds
  • Overall Dimensions:
    • Length: 10.3125"
    • Height (on base): 14.75" (including finderscope)

Our Product Research Team

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