The launch of Nasa's Tess Planetary Hunters has been postponed and will start no earlier than Wednesday.
The telescope was to launch from Cape Canaveral in Florida at 1
But the flight was canceled about three hours before the start.
SpaceX said he wanted to spend more time to understand a problem related to the guidance, navigation and control of his vehicle.  The company added that its teams are now working towards a launch on April 18 at 18:51 EDT (2351 BST).
The BBC knows that scientists on the mission may also want a delay so they can do some extra examinations. Exoplanet Survey Satellite itself.
When Tess gets up, she'll be staring at stars for weeks, hoping to jump the brightness capture when the worlds circling around them are moving over their faces.
It is expected to identify 2000-3000 planets in the first two years of operation.
The satellite, which carries four camera detectors, will essentially put together a catalog, and the other telescopes – both on the ground and in space – will allow you to focus on a more detailed analysis.
"Think of it as a telephone directory, and you can look up those that interest you," said Sara Seager of the Massachusetts Institute of Technology (MIT), which leads the Tess project.
"But it's not just quantity, but quality as well – because the planets we find are bright enough and close enough to Earth that we can take measurements with them."
Perhaps the key player in this future study is Hubble's successor – James Webb Space Observatory, that should be in orbit from 2020
It promises the ability to dissolve the atmospheres of some of the new worlds, to search for gases that could indicate the presence of life.
James Webb will "seek out the chemical composition of these atmospheres and look for what's there," said Paul Hertz, director of astrophysics at NASA. "People are very interested in finding what on earth are bio-signatures, like methane, carbon dioxide, water vapor and oxygen."
Bill Chaplin is an astro-seismologist from the University of Birmingham, UK. He is interested in the brightness variations of the stars observed by Tess.
This variability is a consequence of resonances in the outer layers of the stars and allows the British professor to extract a lot of additional information.
"We can measure the basic properties of the stars, we can say how tall they are and how old they are, and we can get an idea of what the inside of a star looks like, so we can essentially do it make the equivalent of ultrasound on them. "