My First Grow- 1 inside and 1 outside :P

[SpacemanSpiff]

Can anyone tell me why my outdoor plant is like 1 third the size of my indoor plant and they're the same age? Is it because the outdoor plant gets half as much light as my indoor one? Is there anything i can do to make it stronger and grow faster?

Yes, that will be because of the difference in light, this is how plants grow, by absorbing and comverting the energy from the light, so the only way you can help it grow bigger is give it more light and wait. For example, you could put it under lights during the night. You could get more lights, or put the bulbs closer to the plants.