so triton surface is mostly nitrogen and methane ice and so what happens is as triton moves through the seasons, you have -- it's methane snow that moves and condenses so it moves from pole to pole and when some hydro carbons get trapped underneath some of the snow and it starts to warm up it turns to a gas and it starts to vent out and that's what you're seeing and i believe the dark marks are very similar to the tholene, another material we see on tighten when methane and other small molecules act with energetic sources in our solar system it forms larger molecules. they're muddy because they're muddy colored. right? >> right. >> get a gold star. >> social media question. >> emily from nasa social media. this question comes from twitter and they're asking when the next opportunity for a mission that could fly by neptune or uranus. >> since it takes a long time with chemical propulsion we would have to use gravity assists. i think there are hundreds of possibles within the next ten years to do that. >> at least a -- been included in the most recent -- huge proponents as i'm sure we all

we're near what's called the triton light and it's a naval beacon.dicated for all those who go to sea associated with the naval academy that they come home safely so a at the naval academy. just beautiful out here this morning so quiet and still along the river. quickly the weather forecast. you know what, we're going to be sunny and warm later today. i mean, we'll have a few clouds you saw there in the live shot and it will be kind of a partly sunny afternoon but it should remain dry. 66 now in washington. kind of sticky out here in annapolis. 67 degrees. 64 in leonardtown. north and west we're doing a few 50's in places like manassas and culpeper but now that the sun is up we're going to warm it up quickly. seven-day forecast, i know the nationals got a big game tonight, a big game tomorrow afternoon. weather couldn't be nicer. as you can see that seven-day forecast looks great for both later this afternoon and as we look at the seven-day forecast, it looks great for saturday as well. so, looks like our next chance for a little rain will arrive on