Using the parameter 'items' will limit the numbers of items returned, regardless of how many are sent in the NASA feed.
If the NASA feed sends fewer items than requested using this parameter, the number of items actually in the NASA feed are all that will be returned.
hi*00*After more than 15 productive years in orbit, the U.S./German GRACE (Gravity Recovery and Climate Experiment) satellite mission has ended science operations.*http://www.nasa.gov/press-release/prolific-earth-gravity-satellites-end-science-mission~hi*01*Media accreditation is open for launch of the next SpaceX commercial cargo resupply services mission to the International Space Station, currently targeted for no earlier than December.*http://www.nasa.gov/press-release/nasa-invites-media-to-upcoming-space-station-cargo-launch~|