I learned about Kepler-78b via the TV Series: NASA’s Unexplained Files, on the Science Channel. The problem is also explained on this Astronomy Picture of the Day [APOD] page for Kepler-78b: https://apod.nasa.gov/apod/ap131105.html.
“Even though Kepler-78b is only slightly larger than the Earth, it should not exist. … Models of planet formation predict that no planet can form in such a close orbit, and models of planet evolution predict that Kepler-78b’s orbit should decay — dooming the planet to eventually merge with its parent star.” —APOD
According to scientists, the position of Kepler-78b so close to its sun – 40 times closer than Mercury is to our sun – could not have happened if the current academic explanation for solar system formation [Sun-First Theory] is really correct. The planet [Kepler-78b] would have had to: form within its nascent sun/star, establish its orbit within this young sun, and then retain its orbit as its sun contracted into a smaller sphere.
According to Mass Vortex Theory, on the other hand, a planet can form at practically any radial distance from the center of the parent vortex. When a dense big pocket of atoms can no longer follow the curved path of the vortext due to its velocity and mass, then it exits the stream of gases comprising the parent vortex. Once it exits, then gravity and the conservation of angular momentum are the dominant rules that affect the planet’s orbit. The gravitational interaction involved is between the planet’s center of mass and the parent vortex’s center of mass (for the part of the vortex that is within the planet’s orbit). Therefore, the presence of Kepler-78b is understandable, no problem.
In Mass Vortex Theory, the sun does not become present until later in the development, after the planets are fully formed. At some point, prior to the birth of the Sun, the center of the Parent Vortex starts to luminesce as atoms follow a tight circular path. Thus, light shines from the center of the system prior to the Sun being born. The planets, however, form in darkness or semi-darkness; any light was from possible distant stars and the beginning of a glow at the center of the Parent Vortex.
*Image above was created from a picture of our sun from the Sun Dynamics Observatory [GSFC NASA] with sunspots of a known size that could be used in comparison to Earth and Kepler 78b; the image for Kepler 78b is an artist conception by Karen Teramura which I re-sized and placed in the ecliptic. Imaging of Kepler-78b from space telescopes or probes is not available.