Astrosyo

A guide for the stars.

Science stories and telescope reviews.

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Cosmic Stories →

How Diffusion Models Work
How Diffusion Models Work

A step-by-step, visual explainer of forward noise and reverse denoising in modern diffusion models.

Spiral Galaxies
Spiral Galaxies

Explore the beauty and physics of spiral galaxies—from density waves and dark matter to stellar nurseries and galactic rotation. Discover how these cosmic pinwheels form, evolve, and create new generations of stars.

Lunar Phases
Lunar Phases

An overview of the phases of our Moon.

Earth and Neptune Size Comparison
Earth and Neptune Size Comparison

The true scale difference between Neptune and Earth.

Reviews →

Meade ETX 125 Review
Meade ETX 125 Review

Meade’s ETX 125 finally fixes the plastic motors and flimsy tripod of the cheaper ETX line, but the upgrades drive the price beyond what most observers should pay for a compact planetary scope.

Meade Polaris 130 EQ Reflector Review
Meade Polaris 130 EQ Reflector Review

Legacy impressions of the Meade Polaris 130 EQ reflector from 2020, highlighting its parabolic optics, deep-sky strengths, and the trade-offs of the lightweight equatorial mount and bundled accessories.

ZWO Seestar S30 Review
ZWO Seestar S30 Review

The Seestar S30 is an ultra-portable smart telescope with a 30 mm apochromatic triplet objective, automated alignment, live stacking, and solar capability, designed for beginners and astrophotographers who want results without complexity.

Celestron AstroMaster 114EQ Review
Celestron AstroMaster 114EQ Review

The Celestron AstroMaster 114EQ uses a cost-cutting Bird-Jones optical design that results in poor image quality, difficult collimation, and frustrating usability.