Lost in Space font here refers to the font used in the poster of Lost in Space, which is a 1998 American science fiction movie that focuses on the Robinson family who undertake a voyage to a nearby star system to begin emigration from a soon-to-be uninhabitable Earth.
The font used for the movie title in the poster is probably Copperplate Gothic 33 BC originally designed by Frederic W. Goudy in the early 1900s for American Type Founders. Copperplate Gothic is characterized by very small and fine serifs. You can view more details about it here.
The Copperplate Gothic font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel, some of which are available for free download.
In addition to Lost in Space, Copperplate Gothic typeface is also used in the following logos, movie posters or album covers etc., including: Universal Orlando, Falling in Reverse, Tru Calling, The Piano, Death Rally, Legendary, North & South, GCB, England Keep My Bones, New Beginning, Cold Tracker, Hyde Park on Hudson, Flyboys, Seabiscuit, Firehouse.