Quantcast

Latest John Callas Stories

374f8e4f96a18d49854fa0310f6b7372
2011-06-03 12:55:00

By Dr. Tony Phillips - Science@NASA At NASA, missions are expected to go the extra mile. The Voyagers are, perhaps, the best known example. Launched in the 1970s to explore the outer planets, the iconic spacecraft have zoomed far beyond their original targets to the edge of interstellar space itself, 9 billion miles from Earth and still making discoveries. Pioneer 10 and 11, Ulysses, Stardust-NEXT, Deep Impact, and others have similar track records. It has become almost routine for...

f094e5ed777700d1ae18ce5ca0c69c351
2010-05-22 07:15:00

Earlier this month, Mars Exploration Project manager John Callas updated a NASA audience at the Marshall Space Flight Center about future prospects for the Mars rovers. Spirit, he says, is in peril from the advancing Martian winter, and Opportunity could soon run into trouble as the rover attempts a daring trek across dangerous terrain. Nevertheless, both rovers are still in the hunt for new discoveries. In other words, it's business as usual on Mars. His report began with the "lucky rover,"...

aee897a0007e04bc82b3819867b21fe4
2010-04-01 12:35:00

NASA's Jet Propulsion Laboratory said Wednesday that the sand-trapped Mars rover Spirit failed to make a scheduled communication this week and may have gone into a power-saving hibernation to survive the planet's winter. Spirit was expected to communicate with the orbiting Mars Odyssey spacecraft on Tuesday. "We are checking other less likely possibilities for the missed communication, but this probably means that Spirit tripped a low-power fault sometime between the last downlink on March...

fc1c4961fc25a28e08f544a1dc78d9d11
2009-04-14 05:00:00

The team operating NASA's Mars Exploration Rover Spirit is examining data received from Spirit in recent days to diagnose why the rover apparently rebooted its computer at least twice over the April 11-12 weekend. "While we don't have an explanation yet, we do know that Spirit's batteries are charged, the solar arrays are producing energy and temperatures are well within allowable ranges. We have time to respond carefully and investigate this thoroughly," said John Callas of NASA's Jet...

c96b5886d2709233b166d8597baac33c
2007-07-03 18:05:00

A giant dust storm brewing for more than a week on Mars has become worse and is affecting surface operations of the Mars Exploration Rovers, Spirit and Opportunity. Because the rovers depend on solar energy for survival, and the dust is partially blocking the sun, the storm is being watched closely by the rover scientists and engineers. Opportunity's entry into Victoria Crater is delayed for at least several days. The storm, the most severe storm yet to hit the rovers, is expected to...

0b5d4d64a988aedb7f0562f97dfd4a3a1
2006-03-17 19:55:00

JPL -- NASA's long-lived Mars rovers demand lots of care as they age and the Martian winter approaches. Dr. John Callas, newly named project manager for NASA's Mars Exploration Rover mission, is coordinating the work to meet these challenges. He is a scientist at NASA's Jet Propulsion Laboratory in Pasadena, Calif. He was named project manager after earlier roles as science manager and deputy project manager for the Spirit and Opportunity rovers. "It continues to be an exciting adventure...

56257c961827242e7d0cca55ba0dc4511
2005-10-25 18:50:00

NASA -- In August 2003, as the twin Mars Exploration Rovers were barreling toward Mars in their flying saucers, scientists and engineers sent a radio signal disguised as the rovers' "voice" to the Odyssey orbiter at Mars. The call to Odyssey was what Dr. John Callas, Mars Exploration Rover Science Manager, defines as a "can-you-hear-me-now?" test. Scientists and engineers wanted to ensure the UHF (ultra-high frequency) radio system on Odyssey, a primary communications relay between the...


Word of the Day
cock-a-hoop
  • Exultant; jubilant; triumphant; on the high horse.
  • Tipsy; slightly intoxicated.
This word may come from the phrase 'to set cock on hoop,' or 'to drink festively.' Its origin otherwise is unclear. A theory, according to the Word Detective, is that it's a 'transliteration of the French phrase 'coq a huppe,' meaning a rooster displaying its crest ('huppe') in a pose of proud defiance.' Therefore, 'cock-a-hoop' would 'liken a drunken man to a boastful and aggressive rooster.'
Related