Here are some possibilities for what could come after the solar system, depending on the context:

Focusing on size and scale:

* Galaxy (Milky Way): Our solar system is located within the Milky Way Galaxy, a massive collection of stars, planets, gas, and dust.

* Local Group: The Milky Way is part of a group of galaxies called the Local Group.

* Supercluster (Virgo Supercluster): The Local Group is part of a larger structure called the Virgo Supercluster.

* Observable Universe: This is the portion of the universe that we can observe from Earth.

Focusing on celestial objects:

* Stars: The Sun is a star, and there are billions of other stars in the galaxy.

* Interstellar Medium: The space between stars is not empty, but filled with gas and dust.

* Nebulae: These are giant clouds of gas and dust where stars are born.

* Black Holes: These are regions of spacetime where gravity is so strong that nothing, not even light, can escape.

Focusing on space exploration:

* Interstellar Travel: This is the idea of traveling between stars, which is currently beyond our technological capabilities.

* Exoplanets: Planets that orbit stars outside of our solar system.

Focusing on scientific concepts:

* Gravity: The force that holds the solar system together.

* Electromagnetism: The force that governs light and other forms of radiation.

* Dark Matter and Dark Energy: These are mysterious substances that seem to make up most of the universe's mass and energy.

To give you a more specific answer, please tell me:

* What is the purpose of your concept map?

* What are you trying to show with it?

* What are the other branches of your concept map?

Once you provide more context, I can help you choose the best things to place after the solar system.