SSA is the acronym of ESA's "Space Situational Awareness" programme, which was the precursor to the current Space Safety Programme. SSA ran between 2009 and 2019. More info at:...

Even if an asteroid misses the Earth, it can come back and hit our planet in a subsequent "return". Whether this happens or not, depends on whether the object passes through well-defined regions in...

On 25 July, an asteroid the size of a football field flew by Earth, coming within 65 000 km of our planet’s surface during its closest approach – about one fifth of the distance to the Moon.

The word NEO stands for near-Earth object, indicating a small body of the Solar System which can come into the Earth’s neighbourhood. A broad classification of NEOs distinguishes NECs (near-Earth...