Your theory would hold true IF a star the size of earth went supernova and had enough mass to create a black hole. It just is not heavy enough.
Black holes are created when **giant stars** go supernova.
Even "medium-sized" black holes are HUGE.
"Medium-size black holes actually do exist, according to the latest findings from NASA's Hubble Space Telescope, but scientists had to look in some unexpected places to find them. The black hole in globular cluster M15 [left] is 4,000 times more massive than our Sun."
http://space.about.com/library/weekly/bliblackholesa.htm
There are no black holes the size of a marble or a house.
"For example to form a black hole the size of a baseball, you would have to pack the entire mass of the Earth into a region about 5 cm across."
http://theory.uwinnipeg.ca/mod_tech/node61.html
I think the smallest star is a neutron star (that can create a black hole), and even when that collapses it has a radius of ~16km. The smallest star is a brown dwarf.
"For a sun or star to be a Black Hole, it would have to have so much mass and gravity that its escape velocity would be greater than 300,000 km/sec, such that even light would not escape."
A star would have to be big enough such that when it collapses and forms a black hole, the density would prevent light from escaping.
"Astronomers have never seen a black hole that is much smaller than the mass of our Sun yet, so we don't know if they really exist."