hayan avistado
-they/you have sighted
Present perfect subjunctiveellos/ellas/ustedesconjugation ofavistar.

avistar

Es pequeña, midiendo tan solo unos 120 pies de ancho y no más de 300 pies de largo, lo que probablemente explica por qué ha demorado tanto tiempo para que los científicos la hayan avistado.
It's small, measuring in at only around 120 feet across and no more than 300 feet wide, which is probably why it has taken so long for scientists to spot it.
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