( ( astronomy ( gravity ( lasers sun ) ) ) ( ( forces ( ( MAGNETIC FIELDS ) ( ARE EVERYWHERE ) ) ) . ) )
(ROOT (S (NP (NN astronomy) (NN gravity) (NNS lasers) (NN sun)) (VP (VBZ forces) (SBAR (S (NP (NNP MAGNETIC) (NNP FIELDS)) (VP (VBP ARE) (ADJP (JJ EVERYWHERE)))))) (. .)))
astronomy gravity lasers sun forces MAGNETIC FIELDS ARE EVERYWHERE.
(ROOT (S (NP (NNP Gravity) (CC and) (NNP magnetism)) (VP (VBP are) (NP (DT both) (JJ common) (NNS forces))) (. .)))
Gravity and magnetism are both common forces.