The Mars Perseverance rover is attached to its rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 23, 2020. The rover and descent stage are the first spacecraft components to come together for launch — and they will be the last to separate when the spacecraft reaches Mars. At about 65 feet over the Martian surface, separation bolts will fire and the descent stage will lower Perseverance onto the Red Planet. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted between July 17 and Aug. 5 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The Mars Perseverance rover is attached to its rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 23, 2020. The rover and descent stage are the first spacecraft components to come together for launch — and they will be the last to separate when the spacecraft reaches Mars. At about 65 feet over the Martian surface, separation bolts will fire and the descent stage will lower Perseverance onto the Red Planet. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted between July 17 and Aug. 5 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The Mars Perseverance rover is attached to its rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 23, 2020. The rover and descent stage are the first spacecraft components to come together for launch — and they will be the last to separate when the spacecraft reaches Mars. At about 65 feet over the Martian surface, separation bolts will fire and the descent stage will lower Perseverance onto the Red Planet. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted between July 17 and Aug. 5 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The Mars Perseverance rover is attached to its rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 23, 2020. The rover and descent stage are the first spacecraft components to come together for launch — and they will be the last to separate when the spacecraft reaches Mars. At about 65 feet over the Martian surface, separation bolts will fire and the descent stage will lower Perseverance onto the Red Planet. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted between July 17 and Aug. 5 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The Mars Perseverance rover is attached to its rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 23, 2020. The rover and descent stage are the first spacecraft components to come together for launch — and they will be the last to separate when the spacecraft reaches Mars. At about 65 feet over the Martian surface, separation bolts will fire and the descent stage will lower Perseverance onto the Red Planet. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted between July 17 and Aug. 5 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The Mars Perseverance rover is attached to its rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 23, 2020. The rover and descent stage are the first spacecraft components to come together for launch — and they will be the last to separate when the spacecraft reaches Mars. At about 65 feet over the Martian surface, separation bolts will fire and the descent stage will lower Perseverance onto the Red Planet. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted between July 17 and Aug. 5 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The Mars Perseverance rover is attached to its rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 23, 2020. The rover and descent stage are the first spacecraft components to come together for launch — and they will be the last to separate when the spacecraft reaches Mars. At about 65 feet over the Martian surface, separation bolts will fire and the descent stage will lower Perseverance onto the Red Planet. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted between July 17 and Aug. 5 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The aeroshell backshell for the Mars Perseverance rover is attached to the rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 29, 2020. The aeroshell will encapsulate and protect Perseverance and its descent stage during their deep space journey to Mars and during descent through the Martian atmosphere. It will reach the Red Planet on Feb. 18, 2021. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted for summer 2020 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The aeroshell backshell for the Mars Perseverance rover is attached to the rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 29, 2020. The aeroshell will encapsulate and protect Perseverance and its descent stage during their deep space journey to Mars and during descent through the Martian atmosphere. It will reach the Red Planet on Feb. 18, 2021. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted for summer 2020 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The powered descent vehicle for the Mars Perseverance rover is stacked inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 28, 2020. The rover and descent stage were the first spacecraft components to come together for launch — and they will be the last to separate when the spacecraft reaches Mars on Feb. 18, 2021. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted for summer 2020 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.

The aeroshell backshell for the Mars Perseverance rover is attached to the rocket-powered descent stage inside the Payload Hazardous Servicing Facility at NASA’s Kennedy Space Center in Florida on April 29, 2020. The aeroshell will encapsulate and protect Perseverance and its descent stage during their deep space journey to Mars and during descent through the Martian atmosphere. It will reach the Red Planet on Feb. 18, 2021. Launch, aboard a United Launch Alliance Atlas V 541 rocket, is targeted for summer 2020 from Cape Canaveral Air Force Station. NASA’s Launch Services Program based at Kennedy is managing the launch.