Question: What are the two branches of Robert D. Braun's career field? 
Context: Muyungang River () is the southernmost one of right-bank tributaries in Changsha section of Xiang River in Hunan, China.  The river has two branches of headwaters risen in Tiaoma Town of Yuhua District, of which the right (western) source originates from Xiyu (), the left (eastern) source rises in Xintian ().  the two streams intersect at Sanxianling ().  From the confluence with two branches of headwaters at Sanxianling, The drainage basin of the river covers an area of about 90 km2 , the trunk stream of the river flows 7.94 km southwest through Tiaoma Town of Yuhua District and Muyun Subdistrict of Tianxin District before merging into Xiang River at the river mouth between Dawantang () and Maziling (). The Bermejo River (Spanish, Río Bermejo) is a river in South America that flows from Bolivia to the Paraguay River in Argentina.  The river is generally called Bermejo in spite of its different names along its way, but it also has its own Native American names; in Wichí it is called Teuco, and in Guaraní it is called Ypitá.  In the plains of Argentina's Gran Chaco the Bermejo forms wetlands and splits into two branches.  The southern branch is the bed of the old Bermejo River, now an intermittent stream called Río Bermejito.  The northern branch is now the main stem of the Bermejo and is called the Teuco River ("Río Teuco"), Bermejo Nuevo, or simply the Bermejo River.  The two branches rejoin at , near Villa Río Bermejito, forming the Lower Bermejo River. Newton Brook is a tributary of Greasby Brook, in Wirral, Merseyside.  The brook starts as two branches, one of which is in the same system of lowland field drainage, south of Hoylake, as the Birket.  The other branch begins in Caldy.  The two branches join just to the west of Larton.  Newton Brook then joins with Greasby Brook, to the north-east of Larton and north of Frankby.  Greasby Brook then merges with Arrowe Brook, which, in turn, merges with the Birket.  The Birket discharges into the West Float at the site of the former Wallasey Pool.  Newton Brook is about 2 mi long. The Texas State Guard (TXSG) is one of three branches of the Texas Military Forces.  Along with the other two branches, the TXSG falls under the command of the Governor of Texas and is administered by the Texas Adjutant General, an appointee of the Governor.  The other two branches of the Texas Military Forces are the Texas Army National Guard and the Texas Air National Guard. Dr. Robert (Bobby) D. Braun is an American aerospace engineer and the dean of the College of Engineering and Applied Science at the University of Colorado Boulder. The Delaware River is a major river on the Atlantic coast of the United States.  It drains an area of 14119 sqmi in five U.S. states—New York, New Jersey, Pennsylvania, Maryland and Delaware.  Rising in two branches in New York state's Catskill Mountains, the river flows 419 mi into Delaware Bay where its waters enter the Atlantic Ocean near Cape May in New Jersey and Cape Henlopen in Delaware.  Not including Delaware Bay, the river's length including its two branches is 388 mi . Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft.  It has two major and overlapping branches: aeronautical engineering and astronautical engineering.  Avionics engineering is similar, but deals with the electronics side of aerospace engineering. The Northern line is a London Underground line that runs essentially from south-west to north London, with two branches through central London and three in the north.  Its southern section runs from in the borough of Merton to in Southwark, where it then divides into two central branches, one via in the West End and the other via in the City.  The central branches re-join at , where the line again divides into two branches, one to and the other to in the borough of Barnet.  On the High Barnet branch there is a short single-station sub-branch to . Konaseema is an area in the Godavari River delta in Andhra Pradesh, India.  It combines both East Godavari and West Godavari districts.Also it popularly called as East Kerala due to it's similarities with the region.  It is surrounded by distributaries of the Godavari River and the Bay of Bengal.  After crossing Rajahmundry, the Godavari splits into two branches which are called Vriddha Gautami (Gautami Godavari) and Vasishta Godavari.  Again the Gautami branch splits into two branches namely Gautami and Nilarevu.  Similarly the Vasishta splits into two branches named Vasishta and Vainateya.  These four branches which join the Bay of Bengal at different places, are forming a delta of length 170 km (110 mi) along the coast of the Bay of Bengal and is called the Konaseema region. The Little Spokane River is a major tributary of the Spokane River, approximately 35 mi (56 km) long, in eastern Washington in the United States.  It drains a rural area of forested foothills and a farming valley north of the city of Spokane along the Idaho-Washington border.  It has two branches one starting west of Newport and the other comes from Eloika lake which is further west.  The two branches come together about a quarter mile east of Milan.  The supply from Eloika is quite warm in the summer and has different fish habitat than the colder branch from Newport.  The best trout fishing is where the two branches come together, but is on private owned land.  It's also a privately owned water body which is rare.
Answer: aeronautical engineering and astronautical engineering