( ( The ( asteroid ( 1951 AT ) ) ) ( ( ( ( was ( named ( ( 1578 Kirkwood ) ( in ( his honor ) ) ) ) ) and ) ( so ( was ( ( the ( lunar ( impact crater ) ) ) ( ( ( Kirkwood , ) ( as ( well as ) ) ) ( ( Indiana ( University 's ) ) ( Kirkwood Observatory ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ asteroid) (CD 1951) (NNS AT)) (VP (VP (VBD was) (VP (VBN named) (NP (NP (NNP 1578) (NNP Kirkwood)) (PP (IN in) (NP (PRP$ his) (NN honor)))))) (CC and) (VP (ADVP (RB so)) (VBD was) (NP (NP (DT the) (NN lunar) (NN impact) (NN crater)) (NP (NP (NNP Kirkwood)) (, ,) (CONJP (RB as) (RB well) (IN as)) (NP (NP (NNP Indiana) (NNP University) (POS 's)) (NNP Kirkwood) (NNP Observatory)))))) (. .)))
The asteroid 1951 AT was named 1578 Kirkwood in his honor and so was the lunar impact crater Kirkwood, as well as Indiana University's Kirkwood Observatory.
(ROOT (S (NP (DT The) (NN lunar) (NN landscape)) (VP (VBZ is) (VP (VBN covered) (PP (IN by) (NP (NP (NNS craters)) (VP (VBN caused) (PP (IN by) (NP (JJ asteroid) (NNS impacts)))))))) (. .)))