Q&A with Sara Seager, deputy director of science on NASA’s TESS mission (members only)

Astronomers have discovered seven roughly Earth-size planets very close to a cool dwarf star some 39 light years from Earth, including three orbiting in the star’s habitable zone where liquid water, a key ingredient for life as it’s known on Earth, could be present, researchers announced Wednesday.

If SpaceX is able to dispatch a robotic Dragon capsule to land on the red planet in 2018 on time and successfully, engineers stand to get a lesson on what it will take to eventually send humans there, capturing key data on an untested Mars landing scheme a decade sooner than NASA could do it, space agency officials said this week.

Orbital ATK’s Antares rocket will deliver the commercial Cygnus supply ship to an orbit with an altitude between 130 miles and 179 miles within about nine minutes of liftoff from Virginia’s Eastern Shore.