The night sky of Cambridge

By day, Evan Kramer, SM '22, works on his PhD in the Aero-Astro Space Systems Lab, developing a satellite tasking algorithm. (His goal is to efficiently tap into a network of satellites with synthetic aperture radar sensors, which can see through all weather and illumination. This would let people quickly image a specific point on Earth in the wake of a natural disaster or other emergency.)

The ISS passes over the aero-astro complex (left) and the Central Utilities Plant, captured by multiple half-second exposures at half-second intervals.

But at night, there's a good chance you can find Kramer on an MIT rooftop, capturing the night sky of Cambridge as you've never seen it before.

The International Space Station (ISS) passes over Kresge Auditorium. Jupiter and Saturn are visible just above the roof. This composite image has 75 frames for the night sky and two frames for the foreground.EVAN KRAMER

Kramer's interest in astrophotography started in high school, when he was looking for a way to convince his friends that observing objects like Jupiter and the moons of Saturn with a telescope was cool. Then he branched out into landscape astrophotography and delved into capturing ultraviolet and infrared as well as visible light.

A composite of six images shows aero-astro grad student Charles Dawson, SM '21, with two of his drones on the roof of Building 3 against the Boston skyline; its starscape featuring Jupiter was shot with a fog filter. This is part of Kramer's ongoing project to create portraits of fellow aero-astro grad students and their work against the night sky.EVAN KRAMERA full-spectrum image of ultraviolet, visible, and infrared light shot from the McNair Building roof shows star trails and air traffic over the Great Dome-and makes tree leaves appear pink. This combines 1,600 frames for the night sky and five for the foreground. EVAN KRAMER

Light pollution makes astrophotography in urban environments tricky, but it's possible with filters and a lot of planning. Kramer composes images with familiar features in the foreground to get people's attention and make them wonder how they were taken-and question their assumptions about what can and can't be seen in the urban night sky.