The first challenge that we have before can do any kind of analysis of these interstellar dust particles is simply to find them.
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	3:det	Discourse=context-background:57->77:4|Entity=(61-abstract-new-cf2-3-coref
2	first	first	ADJ	JJ	Degree=Pos|NumType=Ord	3	amod	3:amod	_
3	challenge	challenge	NOUN	NN	Number=Sing	22	nsubj:outer	6:obj|22:nsubj:outer	_
4	that	that	PRON	WDT	PronType=Rel	6	obj	3:ref	Discourse=elaboration-attribute:58->57:0
5	we	we	PRON	PRP	Case=Nom|Number=Plur|Person=1|PronType=Prs	6	nsubj	6:nsubj	Entity=(51-person-giv:inact-cf3-1-ana)
6	have	have	VERB	VBP	Mood=Ind|Number=Plur|Person=1|Tense=Pres|VerbForm=Fin	3	acl:relcl	3:acl:relcl	_
7	before	before	SCONJ	IN	_	9	mark	9:mark	Discourse=context-circumstance:59->58:0
8	can	can	AUX	MD	Typo=Yes|VerbForm=Fin	9	aux	9:aux	CorrectForm=we can|XML=<sic ana:::"we can"></sic>
9	do	do	VERB	VB	VerbForm=Inf	6	advcl	6:advcl:before	_
10	any	any	DET	DT	PronType=Ind	11	det	11:det	Entity=(62-abstract-new-cf4-2-sgl
11	kind	kind	NOUN	NN	Number=Sing	9	obj	9:obj	_
12	of	of	ADP	IN	_	13	case	13:case	_
13	analysis	analysis	NOUN	NN	Number=Sing	11	nmod	11:nmod:of	_
14	of	of	ADP	IN	_	18	case	18:case	_
15	these	this	DET	DT	Number=Plur|PronType=Dem	18	det	18:det	Entity=(11-object-giv:inact-cf1-4-coref
16	interstellar	interstellar	ADJ	JJ	Degree=Pos	18	amod	18:amod	Entity=(63-substance-new-cf5-2-coref
17	dust	dust	NOUN	NN	Number=Sing	18	compound	18:compound	Entity=63)
18	particles	particle	NOUN	NNS	Number=Plur	13	nmod	13:nmod:of	Entity=11)62)61)
19	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	22	cop	22:cop	Discourse=same-unit_m:60->57:1
20	simply	simply	ADV	RB	Degree=Pos	22	advmod	22:advmod	_
21	to	to	PART	TO	_	22	mark	22:mark	Entity=(61-abstract-giv:act-cf2-2-disc
22	find	find	VERB	VB	VerbForm=Inf	0	root	0:root	_
23	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	22	obj	22:obj	Entity=(11-object-giv:act-cf1-1-ana)61)|SpaceAfter=No
24	.	.	PUNCT	.	_	22	punct	22:punct	_
