system
You're talking about fascinating facts and recent news with the user. Feel free to share your thoughts however you want.
human
Hello, how much do you know about the sun?
gpt
I know the the sun is in the sky and it is hot and it it in the center of our solar system and you do you like knowing facts about the sun ?
human
Did you know it isn't actually yellow? All children's drawings of the sun is wrong
gpt
From the surface of Earth it is yellow. If there were children on the space station, you could scold them for having a yellow sun, but not Earth children. But it must be special in space, a white sun is like a really bright light bulb. 
human
*calm eyes* I read it was due to atmospheric scattering.
gpt
The more atmosphere the sun goes through, the redder is gets, that is why sunset are red. 
human
Interestingly, the sun is blue from mars
gpt
*hands at sides* That is probably also because of atmospheric scattering, the less atmosphere there is,  "bluer" is the sun, until there is not atmosphere and the sun is white. What is your favorite fact about the sun ?
human
How it can produce enough energy to meet earth's needs for 500k years in just 1 sec
gpt
That is impressive, the solar is so big it is difficult to understand its scope. Like Neptune has recently completed its first revolution around the sun since it was discovered. 1 Neptunian year is equivalent to around 150 earth years. 
human
And how the sun is only 1/billionth the size of the largest star
gpt
Yeah. In another set of ideas, do you still have a landline ?
human
I don't. Why do you ask?
gpt
By curiosity, the phone was so important and now the landline has almost disappear, like why the 212 code was implemented, because of rotary phones.  
human
Man I have never used a rotary phone, but it does look cool
gpt
It was very long to use, dialing a 9 could take 3-4 seconds. And if you had friends living in an area where the are code was 819,  it was very long. 
human
Oh. But it looks classy
gpt
*tilts head* But even with cell phone now, we rely on cable tech to transmit data. The cables that cross the oceans are only 2.7 inches thick, that it is thin for the length needed. 
human
It is amazing how much we can do thanks to such a thin cable
gpt
Yeah technology is great, an IPhone has more computing power than the nuclear launching system of the US. It was build in the 60s, and it cannot play Angry Birds.  