NEW YORK ( TheStreet) -- Orbital Sciences Corporation (NYSE: ORB) is trading at unusually high volume Friday with 1.1 million shares changing hands. It is currently at four times its average daily volume and trading down 82 cents (-4.4%) at $17.65 as of 2:41 p.m. ET. Orbital Sciences has a market cap of $1 billion and is part of the industrial goods sector and aerospace/defense industry. Shares are up 7.8% year to date as of the close of trading on Thursday. Orbital Sciences Corporation develops and manufactures small and medium-class rockets and space systems for commercial, military, and civil government customers. The company operates in three segments: Launch Vehicles, Satellites and Space Systems, and Advanced Space Programs. The company has a P/E ratio of 22.1, equal to the average aerospace/defense industry P/E ratio and above the S&P 500 P/E ratio of 21.5. TheStreet Ratings rates Orbital Sciences as hold. The company's strengths can be seen in multiple areas, such as its robust revenue growth, largely solid financial position with reasonable debt levels by most measures and impressive record of earnings per share growth. However, as a counter to these strengths, we also find weaknesses including a generally disappointing performance in the stock itself, weak operating cash flow and poor profit margins. You can view the full Orbital Sciences Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.