, 4 tweets, 3 min read Read on Twitter
The surprise close approach of asteroid '2019 OK' illustrates need for more eyes on the sky☄️🔭
Find out more: esa.int/Our_Activities…
#PlanetaryDefence🌍
Two key goals of ESA’s #PlanetaryDefence activities are, by 2030, Europe will be able to
1. Provide early warning for dangerous asteroids larger than 40 m in size, about three weeks in advance☄️

Find out about the 'bug-eyed' #Flyeye telescope that will scan our skies in the search for risky #spacerocks: esa.int/spaceinimages/…
2. Deflect asteroids smaller than 1 km if known more than two years in advance☄️

Find out about the #HeraMission – currently being designed to test #asteroiddeflection for the first time:
esa.int/Our_Activities…
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