Which astronomy platform pioneered the 'pay-per-celestial-event' subscription model that revolutionized public access to real-time space observations?

The astronomy industry has evolved from traditional observatories to digital platforms offering space observations and data to enthusiasts worldwide. Subscription models have transformed how people access astronomical information and viewing experiences. Test your knowledge on how major astronomy brands position their subscription offerings in this competitive cosmic market!

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Slooh, with its event-based access to remote telescopes allowing subscribers to pay only for specific astronomical events they want to view
Stellarium Premium, with its tiered subscription model that unlocks additional celestial objects based on payment level
NASA's Astronomy Picture of the Day (APOD) Plus, with its premium content subscription for enhanced resolution images
Sky & Telescope Pro, with its micropayment system for accessing specialized astrophotography tutorials and equipment reviews