Based on the novel 'Contact' by Carl Sagan (1985)
Worth watching a fajillion times because of a brilliant story & screenplay and multitudes of layered meanings that criss-cross science, religion, the tug-of-war between pure scientific enquiry & beaurocratic douchebaggery, the virtues of patience & integrity in the pursuit of truth, daddy issues and the tussle between reason & faith (which may not be an 'either-or' debate at all).
And kickass radioastronomy that includes nerdgasmic scenes from radiotelescopes like Arecibo and the VLA.
Plus cool SETI stuff and brilliantly imagined ET-tech eg: a transportation pod with cool features like doors that become seamless as soon as they shut and...well...the ability to travel through wormholes in the universe at relativistic speeds.
Plus, a strong female character (that could've just as easily been written male), carved to perfection by Carl Sagan, who does cool shit like climb into alien-pods that are likely to kill her - all in the interest of satisfying her scientific curiousity & furthering human knowledge - while her impossibly gorgeous man-friend waits on the sidelines for her to return from her adventures. Full feminist marks.
Plus the hot, hot, HOT Matthew McConaughey, who argues for spiritual faith, while mastering the intricacies of Special Relativity, while managing to look convincingly in love with the biggest girl-geek Hollywood has ever created.
But mostly, it's worth watching because of the most epic movie finale in the history of all films ever made by humans. (What do you mean I haven't seen 'all films ever'? What're you, my mother?):
(Pssst: There are Indian astrophysicists like Jodie Foster's character from Contact, who have dedicated their research lives to the Search for Extra Terrestrial Intelligence. I wonder what their backstory is...)