The Solar Probe Plus (SPP) mission is the first spacecraft to fly into the solar corona, aiming to understand the structure and dynamics of the Sun's coronal magnetic field, the heating and acceleration of the solar wind, and the processes that accelerate energetic particles. This mission, confirmed in March 2014, is part of NASA's Living with a Star (LWS) Program and is scheduled for launch in mid-2018. It will perform 24 orbits over a 7-year mission, with seven Venus gravity assists gradually reducing its perihelion from 35 solar radii (R_S) to less than 10 R_S. The mission will sample the solar wind in all its modalities as it evolves with rising solar activity. SPP will orbit the Sun in the ecliptic plane, not sampling the fast wind directly above the polar regions, but will compensate for this by spending extended time inside 20 R_S. The mission will measure the solar wind and energetic particles in situ, enabling testing of theories and models for the Sun's coronal magnetic field, heating, and acceleration. The primary science objectives of SPP are to trace the flow of energy that heats the solar corona and accelerates the solar wind, determine the structure and dynamics of the plasma and magnetic fields at the sources of the solar wind, and explore mechanisms that accelerate and transport energetic particles. SPP will measure the turbulence levels inside the critical point, verify whether a nonlinear cascade contributes to coronal heating, and measure the rms energies inside the Alfvén point to support or disprove low-frequency Alfvénic turbulence as a contributor to fast solar wind heating. The mission will also determine the roles of shocks, reconnection, waves, and turbulence in the acceleration of energetic particles, and identify the source populations and physical conditions necessary for energetic particle acceleration. SPP will measure the intensities, energy spectra, and pitch-angle distributions of energetic electrons, protons, and heavy ions in the innermost region of the heliosphere. The mission will also explore how energetic particles are transported in the corona and heliosphere, and how the plasma environment affects the dynamical evolution of solar wind turbulence. SPP will provide direct measurements of the solar wind and energetic particles, enabling the identification of the physical processes involved in wind formation and the determination of the magnetic connectivity to the source regions. The mission will also determine how the observed structures in the corona evolve into the solar wind and how the processes in the corona affect the properties of the solar wind in the heliosphere. SPP will measure the role of shocks, reconnection, waves, and turbulence in the acceleration of energetic particles and identify the source populations and physical conditions necessary for energetic particle acceleration. The mission will also determine how energetic particles are transported in the corona and heliosphere, and how the plasma environment affects the dynamical evolution of solar wind turbulenceThe Solar Probe Plus (SPP) mission is the first spacecraft to fly into the solar corona, aiming to understand the structure and dynamics of the Sun's coronal magnetic field, the heating and acceleration of the solar wind, and the processes that accelerate energetic particles. This mission, confirmed in March 2014, is part of NASA's Living with a Star (LWS) Program and is scheduled for launch in mid-2018. It will perform 24 orbits over a 7-year mission, with seven Venus gravity assists gradually reducing its perihelion from 35 solar radii (R_S) to less than 10 R_S. The mission will sample the solar wind in all its modalities as it evolves with rising solar activity. SPP will orbit the Sun in the ecliptic plane, not sampling the fast wind directly above the polar regions, but will compensate for this by spending extended time inside 20 R_S. The mission will measure the solar wind and energetic particles in situ, enabling testing of theories and models for the Sun's coronal magnetic field, heating, and acceleration. The primary science objectives of SPP are to trace the flow of energy that heats the solar corona and accelerates the solar wind, determine the structure and dynamics of the plasma and magnetic fields at the sources of the solar wind, and explore mechanisms that accelerate and transport energetic particles. SPP will measure the turbulence levels inside the critical point, verify whether a nonlinear cascade contributes to coronal heating, and measure the rms energies inside the Alfvén point to support or disprove low-frequency Alfvénic turbulence as a contributor to fast solar wind heating. The mission will also determine the roles of shocks, reconnection, waves, and turbulence in the acceleration of energetic particles, and identify the source populations and physical conditions necessary for energetic particle acceleration. SPP will measure the intensities, energy spectra, and pitch-angle distributions of energetic electrons, protons, and heavy ions in the innermost region of the heliosphere. The mission will also explore how energetic particles are transported in the corona and heliosphere, and how the plasma environment affects the dynamical evolution of solar wind turbulence. SPP will provide direct measurements of the solar wind and energetic particles, enabling the identification of the physical processes involved in wind formation and the determination of the magnetic connectivity to the source regions. The mission will also determine how the observed structures in the corona evolve into the solar wind and how the processes in the corona affect the properties of the solar wind in the heliosphere. SPP will measure the role of shocks, reconnection, waves, and turbulence in the acceleration of energetic particles and identify the source populations and physical conditions necessary for energetic particle acceleration. The mission will also determine how energetic particles are transported in the corona and heliosphere, and how the plasma environment affects the dynamical evolution of solar wind turbulence