If you want to invest in the future, splitting your investment between Elon Musk's two companies, Space Exploration Technologies (SPCX +7.63%) and Tesla (TSLA +3.43%), could be a solid bet. With just under $10,000 split between the two stocks, investors could buy 14 shares of Tesla and 34 shares of SpaceX.Tesla is the older of Musk's two companies, and it has established electric vehicle (EV), solar, and energy storage businesses. However, what gets investors most excited is what the company has in store fo ...