No, Julia Roberts had nothing to do with Star Trek: First
Contact.
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The posted gross for Star Trek: First Contact was $150
Million.
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No
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I do not think there is an official "Star Trek day", but First
Contact Day (April 25th) could be considered as "Star Trek
day".
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If you are talking about the Star Trek enterprise E from movies
such as Nemesis, Insurrection and First Contact, it is, and I quote
from the movie Star Trek First Contact Picard: "There are 24 decks,
almost 700 metres long"