Will Elon Musk's SpaceX get humans to Mars by 2026? Some experts have raised doubts about the timeframe.

SpaceX, founded by Elon Musk, is building and launching Starship prototypes in Boca Chica, Texas.
SpaceX; Mark Brake/Getty Images; Business Insider
Elon Musk's timeline for SpaceX landing humans on Mars has wavered over the years.
He recently said 2026 will be the year to send a crewed mission to Mars. In 2017, he said 2024.
Space industry experts believe SpaceX will reach Mars, but not as soon as it hopes.
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Elon Musk is still confident that 20