SpaceX is set to send up the 30th launch on the Space Coast this year targeting an evening liftoff Tuesday that would see the 300th booster recovery if successful.

A Falcon 9 rocket carrying 23 of SpaceX's Starlink internet satellites is aiming to launch at 6:17 p.m. at the opening of a four-hour window Tuesday that runs from 6:15-10:15 p.m. A backup opportunity falls from 5:50-9:50 p.m. Wednesday.

Space Launch Delta 45's weather squadron forecasts better than 95% chance for good conditions for both Tuesday and the Wednesday backup.

The first-stage booster will set a milestone for the company marking the 300th time a Falcon 9 or Falcon Heavy booster has made a recovery landing, and the 270th time SpaceX has reflown a booster.

This particular booster is flying for the ninth time including one human spaceflight, Crew-6, and SpaceX will attempt its recovery landing downrange on the droneship Just Read the Instructions stationed in the Atlantic Ocean.

The company's first successful booster recovery came in December 2015, and it has not had a failed booster landing since February 2021.

NASA recently announced that it is seeking new ways to complete the return to Earth of rock cores drilled by the Perseverance Rover in the Jezero Crater on Mars. This has led to some anxiety among space scientists, who view the Mars Sample Return (MSR) mission as a cornerstone of plans to explore the solar system.

But when you consider what's at stake, scientifically and politically, it seems highly likely that NASA will push ahead with the mission to make it a success.

One key conclusion of the NASA review is that MSR was established with unrealistic budget and schedules. Now it expects a cost of US$8–11 billion (£6.5–8.9 billion), having originally estimated $5.3 billion. That's not including the investment that the European Space Agency (ESA) is making, which is probably of the order of €2 billion (£1.7 billion).