You have highlighted what planetary defense scientists consider their most dangerous blind spot.
Because ground-based optical telescopes can only observe the night sky, any celestial body approaching from the daytime sky—that is, coming from the direction of the Sun—is completely masked by intense glare.
To overcome this critical vulnerability, humanity is actively developing specific space-based and early-warning solutions.
Deploying Space Telescopes Toward the Sun: NEO Surveyor
If Earth-bound telescopes are blinded by the Sun, the logical solution is to place telescopes directly into space.
Pivoting to Early Warning and Evacuation Systems
What if a small space rock bypasses space telescopes and is detected only a few hours before entry? Because physical interception remains impossible on short notice, planetary defense strategy shifts entirely toward rapid public warnings and evacuation protocols.
Summary
An approach from the direction of the Sun currently represents a genuine blind spot for ground-based observation.
However, humanity is actively closing this gap by launching infrared space telescopes into orbit while simultaneously refining rapid civil warning systems to protect populations even when an object arrives with minimal notice.
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