[bmsleight_]

The satellite appear to have lights on - or is this just reflections from the Sun ?

[bagels]

Aluminized insulation reflecting the sun.

https://en.wikipedia.org/wiki/Landsat_8

[AnotherGoodName]

And sharp lines of reflection as there's nothing to diffuse the light from the sun which is why it's more sparkly than you may expect.

[tantalor]

Those are so it can see where it's going

[bhaney]

Satellite-headlights: because the space-streetlights keep floating away!

[wkat4242]

Satellites don't have lights. It must be reflection.

Especially a photographic sat wouldn't have lights, all it could do is light up nearby dust and debris and make it more visible.