Dalton described atoms as solid spheres. Thomson discovered the the atom also contained negatively charged particles called electrons distributed in such a way that the atom had no charge.
If i remember correctly, Dalton's focuses more on the nucleus while Thompson's focuses more on electrons. But I'm not sure. well in 1803 John Dalton makes a strong case that atoms are small, solid...
In a heliocentric model the Sun is the center of the universe e.g. planets gravitate around the Sun due to centripetal forces. In contrast, in a geocentric model, everything orbitates around "geo" or...