( ( ( ( ( The thermosphere ) , ) ( ( the ( highest layer ) ) ( of ( our atmosphere ) ) ) ) , ) ( ( ( is constantly ) ( bombarded ( by ( unfiltered ( solar radiation ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN thermosphere)) (, ,) (NP (NP (DT the) (JJS highest) (NN layer)) (PP (IN of) (NP (PRP$ our) (NN atmosphere)))) (, ,)) (VP (VBZ is) (ADVP (RB constantly)) (VP (VBN bombarded) (PP (IN by) (NP (JJ unfiltered) (JJ solar) (NN radiation))))) (. .)))
The thermosphere, the highest layer of our atmosphere, is constantly bombarded by unfiltered solar radiation.
(ROOT (S (NP (NNP Thermosphere)) (VP (VBZ is) (NP (DT the) (JJ upper-most) (NN atmosphere))) (. .)))