According to scientists, if there are heavenly bodies, their diameter does not exceed 5.7 km. This is the conclusion the researchers came from observations, which were conducted between December 2008 and February 2009. At this time, two identical STEREO project staff to observe the behavior of the Sun. It was assumed that during this period of time should double vulkanoidy pass near the spacecraft, but it did not.
Four experts analyzed data sets STEREO independently. As a result, scientists have come to the same conclusion: with a probability of 99.7% of asteroids with a diameter of more than 5.7 km in the vicinity of the Sun is not present.
Vulkanoidami called asteroids, which are supposed scientists rotate inside the orbit of Mercury. They got their name from a hypothetical planet Vulcan, whose existence is postulated in the XIX century, Urbain Le Verrier to explain the anomalies in the behavior of the planet closest to the Sun. Subsequently, the motion of Mercury could be explained by the general theory of relativity, and the need for the planet Vulcan anymore. However, astronomers estimate that in the region between 0.08 and 0.21, the distance from the Earth to the Sun vulkanoidov existence is possible.