Earlier this year the Hubble Telescope made this eerie image of what appears to be a hole in Jupiter’s Great Red Spot, commonly referred to as GRS, which almost resembles an eye.

The ‘hole,’ it turns out, was actually just a well-timed shadow, captured by one of Hubble’s cameras as Jupiter’s moon Ganymede passed by.

GRS is a massive, ongoing storm within Jupiter’s atmosphere that would be similar to a hurricane on earth. The red spot may appear relatively small from our vantage point, but is so large that three earths could fit within its boundaries.

However, the Great Red Spot may not be so fearsome in years to come, as scientists have observed the spot’s decline in size since the 1930’s.

Read next: 20 Breathtaking Images Of The Earth As Seen From Space

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