A "leap" second, is being added to account for the fact that it is taking Earth longer and longer to complete one full turn. Scientists know this from VLBI measurements, which are also used in the time standard UT1.
VLBI was originally invented in the 1960s to take better pictures of quasars, but scientists soon found that if you threw the process in reverse, you could measure how the ground beneath the telescopes moves around, how long days really are, and how the Earth wobbles on its axis!
The laser altimeter on NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft has returned data that indicate ice may make up as much as 22 percent of the surface material in Shackleton crater at the moon's south pole.
NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft will get a "front-row seat" to the total lunar eclipse on Dec. 10, 2011, and will take temperature measurements as Earth's shadow blankets the moon.
Noah Petro explains how the new images of three Apollo landing sites give us a clearer view of where the astronauts went, where they sampled and where they conducted scientific experiments on the lunar surface.
Desert Research And Technology Studies (D-R.A.T.S) kicks off an exciting new year of field testing. The crew is back in action, testing communication scenarios for near-Earth asteroids and two new instruments from Goddard: ExPED and VAPoR.
Greg Neumann (698) is a team member of the Mercury Laser Altimeter (MLA) instrument on the MESSENGER spacecraft. In its first two months of operation, the MLA has already built up a topographic grid of the northern hemisphere.
Goddard will manage this 2016 mission to return samples from asteroid 1999 RQ36 and provide the OVIRS instrument, with Solar System Exploration Division staff in a range of project scientist, instrument scientist, and science co-investigator roles. Project Scientist: Joe Nuth, with Jason Dworkin as deputy and Lucy Lim as assistant PS; OVIRS Instrument Scientist: Dennis Reuter, with Amy Simon-Miller as deputy IS; Science Co-Investigators: Danny Glavin and David Rowlands.
Erwan Mazarico (698), Greg Neumann (698), and Mark Torrence (698/SGT) are part of a team that used LOLA data to map slopes and roughness of the moon's surface, revealing important clues about processes that shaped the moon.