A United Launch Alliance Atlas V rocket arrives at the launch pad at Cape Canaveral Air Force Station's Space Launch Complex 41. A Cygnus spacecraft is scheduled to deliver 7,700 pounds of supplies and research experiments on the Orbital ATK CRS-6 mission to the International Space Station.

A United Launch Alliance Atlas V rocket arrives at the launch pad at Cape Canaveral Air Force Station's Space Launch Complex 41. A Cygnus spacecraft is scheduled to deliver 7,700 pounds of supplies and research experiments on the Orbital ATK CRS-6 mission to the International Space Station.

A United Launch Alliance Atlas V rocket is moved from the Vertical Integration Facility to the launch pad at Cape Canaveral Air Force Station's Space Launch Complex 41. A Cygnus spacecraft is scheduled to deliver 7,700 pounds of supplies and research experiments on the Orbital ATK CRS-6 mission to the International Space Station.

At Cape Canaveral Air Force Station's Space Launch Complex 41, a United Launch Alliance Atlas V rocket with a single-engine Centaur upper stage stands ready to boost an Orbital ATK Cygnus spacecraft on a resupply mission to the International Space Station. Science payloads include the second generation of a portable onboard printer to demonstrate three-dimensional printing, an instrument for first space-based observations of the chemical composition of meteors entering Earth’s atmosphere and an experiment to study how fires burn in microgravity.

A United Launch Alliance Atlas V rocket is moved from the Vertical Integration Facility to the launch pad at Cape Canaveral Air Force Station's Space Launch Complex 41. A Cygnus spacecraft is scheduled to deliver 7,700 pounds of supplies and research experiments on the Orbital ATK CRS-6 mission to the International Space Station.

At Cape Canaveral Air Force Station's Space Launch Complex 41, a United Launch Alliance Atlas V rocket with a single-engine Centaur upper stage stands ready to boost an Orbital ATK Cygnus spacecraft on a resupply mission to the International Space Station. Science payloads include the second generation of a portable onboard printer to demonstrate three-dimensional printing, an instrument for first space-based observations of the chemical composition of meteors entering Earth’s atmosphere and an experiment to study how fires burn in microgravity.

A United Launch Alliance Atlas V rocket arrives at the launch pad at Cape Canaveral Air Force Station's Space Launch Complex 41. A Cygnus spacecraft is scheduled to deliver 7,700 pounds of supplies and research experiments on the Orbital ATK CRS-6 mission to the International Space Station.

A United Launch Alliance Atlas V rocket arrives at the launch pad at Cape Canaveral Air Force Station's Space Launch Complex 41. A Cygnus spacecraft is scheduled to deliver 7,700 pounds of supplies and research experiments on the Orbital ATK CRS-6 mission to the International Space Station.

At Cape Canaveral Air Force Station's Space Launch Complex 41, a United Launch Alliance Atlas V rocket with a single-engine Centaur upper stage stands ready to boost an Orbital ATK Cygnus spacecraft on a resupply mission to the International Space Station. Science payloads include the second generation of a portable onboard printer to demonstrate three-dimensional printing, an instrument for first space-based observations of the chemical composition of meteors entering Earth’s atmosphere and an experiment to study how fires burn in microgravity.

At Cape Canaveral Air Force Station's Space Launch Complex 41, a United Launch Alliance Atlas V rocket with a single-engine Centaur upper stage stands ready to boost an Orbital ATK Cygnus spacecraft on a resupply mission to the International Space Station. Science payloads include the second generation of a portable onboard printer to demonstrate three-dimensional printing, an instrument for first space-based observations of the chemical composition of meteors entering Earth’s atmosphere and an experiment to study how fires burn in microgravity.

A United Launch Alliance Atlas V rocket is moved from the Vertical Integration Facility to the launch pad at Cape Canaveral Air Force Station's Space Launch Complex 41. A Cygnus spacecraft is scheduled to deliver 7,700 pounds of supplies and research experiments on the Orbital ATK CRS-6 mission to the International Space Station.

At Cape Canaveral Air Force Station's Space Launch Complex 41, a United Launch Alliance Atlas V rocket with a single-engine Centaur upper stage stands ready to boost an Orbital ATK Cygnus spacecraft on a resupply mission to the International Space Station. Science payloads include the second generation of a portable onboard printer to demonstrate three-dimensional printing, an instrument for first space-based observations of the chemical composition of meteors entering Earth’s atmosphere and an experiment to study how fires burn in microgravity.