### Instruction:

Extract the cause and effect entities from the following sentence:
Conversely, it is well recognized that observatories that do not add new capabilities over time quickly become scientifically irrelevant, often limiting the overall scientific return on the original capital investment

### Assistant:

VARIABLE: the overall scientific return on the original capital investment
KEYWORD: that
CONDITION: often limiting
CAUSE_1: do not add new capabilities over time
EFFECT_1: quickly become scientifically irrelevant
EFFECT_2: often limiting the overall scientific return on the original capital investment
NOT_RELEVANT: Conversely, it is well recognized that
NEGATION: do not

