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Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.

Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.

Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.

Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.

Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.

Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.

Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.

Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.

Discovered in March by astronomers using the Zwicky Transient Facility’s wide-field survey camera at the Palomar Observatory in San Diego County, California, Comet C/2022 E3 (ZTF) was last visible in the night sky during the Stone Age — about 50,000 years ago.