Can we estimate the total number of stars?
"Gaia will monitor each of its 1 billion target stars 70 times during a five-year period, precisely charting their positions, distances, movements and changes in brightness,"."Combined, these measurements will build an unprecedented picture of the structure and evolution of our galaxy.
Or should it?"It's a logical way to define distance, but not how a relativist defines distance," Kornreich said. A relativist would use a device such as a meter stick, measuring the distance along that device and then extending it as long as needed. This produces a different answer, which some sources define as 48 billion light-years in radius. Sources vary on this number, however. That's because space-time can curve. As the observer does the measurement with the meter sticks, light travels at the same time and influences the measurements.Galaxy observations
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