Final answer:
The capitalization of 'Northern Lights' depends on the context. It should be capitalized when used as a proper noun and may be capitalized in scientific contexts.
Step-by-step explanation:
The capitalization of the term 'Northern Lights' depends on the context. In general, proper nouns such as the names of specific celestial phenomena, like the Northern Lights, should be capitalized. However, if 'Northern Lights' is used as a general term to refer to any natural light display in the northern hemisphere, it may not be capitalized.
For example, in the sentence 'I saw the Northern Lights last night,' 'Northern Lights' should be capitalized because it refers to the specific phenomenon. On the other hand, in the sentence 'She loves watching the northern lights,' 'northern lights' should not be capitalized since it is a general description.
In scientific contexts or formal writing, it is often preferred to capitalize 'Northern Lights' to indicate its significance and recognition as a proper noun.