Just caught something interesting about Alphabet's space bet that most people probably aren't talking about enough. The search giant's investment arm is sitting on 8.9 million shares of AST SpaceMobile, making it their biggest public stock position at around $903 million. That's a serious commitment to buying shares in what's essentially a moonshot satellite play.

So what's the actual story here? AST SpaceMobile is building a global cellular network from low Earth orbit. Think of it as trying to beam 5G coverage to your phone from space, anywhere on the planet. Alphabet got in early through convertible notes back in early 2024 at $5.75 per share, alongside AT&T and Vodafone. When the stock popped, those notes converted into roughly 26 million shares across all investors, and Alphabet ended up with 8.9 million of them.

The company's already landed some serious contracts - we're talking 50 mobile operators representing 3 billion subscribers, plus government deals including work with the Space Development Agency and Defense Innovation Unit. That kind of traction suggests the market is taking this seriously.

Here's where it gets real though. AST SpaceMobile has been deploying BlueBird satellites and claims to have six in orbit already, with a seventh lined up. Their goal is hitting 45 to 60 satellites by now to cover key markets in the US, Europe, and Japan. Each satellite costs between $21-23 million, so the capital requirements are massive. But the good news? The company raised $2.8 billion in cash by year-end, plus another $1 billion through convertible notes in February. Management says they're now fully funded for a 100-satellite constellation.

Now, if you're thinking about buying shares yourself, here's the reality check. Analysts are projecting $178 million in revenue for this year, jumping to $805 million in 2027 and $2 billion by 2028, with profitability expected by 2028. Sounds great on paper. But the valuation is absolutely brutal - the stock trades at 155x this year's projected sales and around 81x projected 2028 earnings. That's not cheap by any stretch.

Alphabet clearly believes in the long-term potential enough to make this their largest public investment. But for regular investors, this isn't a casual position. You need the risk tolerance for a high-growth, capital-intensive space company and the stomach for serious volatility. It's the kind of bet that either looks genius or painful in five years - there's probably no middle ground here.