<Table> Milky Way Galaxy <Tr> <Td colspan="2"> The Milky Way 's Galactic Center in the night sky above the Paranal Observatory ( the laser creates a guide - star for the telescope ) . </Td> </Tr> <Tr> <Th colspan="2"> Observation data </Th> </Tr> <Tr> <Th> Type </Th> <Td> Sb , Sbc , or SB ( rs ) bc ( barred spiral galaxy ) </Td> </Tr> <Tr> <Th> Diameter </Th> <Td> 100 -- 180 kly ( 31 -- 55 kpc ) </Td> </Tr> <Tr> <Th> Thickness of thin stellar disk </Th> <Td> ≈ 2 kly ( 0.6 kpc ) </Td> </Tr> <Tr> <Th> Number of stars </Th> <Td> 100 -- 400 billion ( 2.5 × 10 ± 1.5 × 10 ) </Td> </Tr> <Tr> <Th> Oldest known star </Th> <Td> ≥ 13.7 Gyr </Td> </Tr> <Tr> <Th> Mass </Th> <Td> 0.8 -- 1.5 × 10 M </Td> </Tr> <Tr> <Th> Angular momentum </Th> <Td> ≈ 7067100000000000000 ♠ 1 × 10 J s </Td> </Tr> <Tr> <Th> Sun 's distance to Galactic Center </Th> <Td> 26.4 ± 1.0 kly ( 8.09 ± 0.31 kpc ) </Td> </Tr> <Tr> <Th> Sun 's Galactic rotation period </Th> <Td> 240 Myr </Td> </Tr> <Tr> <Th> Spiral pattern rotation period </Th> <Td> 220 -- 360 Myr </Td> </Tr> <Tr> <Th> Bar pattern rotation period </Th> <Td> 100 -- 120 Myr </Td> </Tr> <Tr> <Th> Speed relative to CMB rest frame </Th> <Td> 631 ± 20 km / s </Td> </Tr> <Tr> <Th> Escape velocity at Sun 's position </Th> <Td> 550 km / s </Td> </Tr> <Tr> <Th> Dark matter density at Sun 's position </Th> <Td> 0.0088 M pc or 0.35 GeV cm </Td> </Tr> <Tr> <Td colspan="2"> See also : Galaxy , List of galaxies </Td> </Tr> </Table>
<Table> Milky Way Galaxy <Tr> <Td colspan="2"> The Milky Way 's Galactic Center in the night sky above the Paranal Observatory ( the laser creates a guide - star for the telescope ) . </Td> </Tr> <Tr> <Th colspan="2"> Observation data </Th> </Tr> <Tr> <Th> Type </Th> <Td> Sb , Sbc , or SB ( rs ) bc ( barred spiral galaxy ) </Td> </Tr> <Tr> <Th> Diameter </Th> <Td> 100 -- 180 kly ( 31 -- 55 kpc ) </Td> </Tr> <Tr> <Th> Thickness of thin stellar disk </Th> <Td> ≈ 2 kly ( 0.6 kpc ) </Td> </Tr> <Tr> <Th> Number of stars </Th> <Td> 100 -- 400 billion ( 2.5 × 10 ± 1.5 × 10 ) </Td> </Tr> <Tr> <Th> Oldest known star </Th> <Td> ≥ 13.7 Gyr </Td> </Tr> <Tr> <Th> Mass </Th> <Td> 0.8 -- 1.5 × 10 M </Td> </Tr> <Tr> <Th> Angular momentum </Th> <Td> ≈ 7067100000000000000 ♠ 1 × 10 J s </Td> </Tr> <Tr> <Th> Sun 's distance to Galactic Center </Th> <Td> 26.4 ± 1.0 kly ( 8.09 ± 0.31 kpc ) </Td> </Tr> <Tr> <Th> Sun 's Galactic rotation period </Th> <Td> 240 Myr </Td> </Tr> <Tr> <Th> Spiral pattern rotation period </Th> <Td> 220 -- 360 Myr </Td> </Tr> <Tr> <Th> Bar pattern rotation period </Th> <Td> 100 -- 120 Myr </Td> </Tr> <Tr> <Th> Speed relative to CMB rest frame </Th> <Td> 631 ± 20 km / s </Td> </Tr> <Tr> <Th> Escape velocity at Sun 's position </Th> <Td> 550 km / s </Td> </Tr> <Tr> <Th> Dark matter density at Sun 's position </Th> <Td> 0.0088 M pc or 0.35 GeV cm </Td> </Tr> <Tr> <Td colspan="2"> See also : Galaxy , List of galaxies </Td> </Tr> </Table>
how many stars in our milky way galaxy
how many stars in our milky way galaxy
100 -- 400 billion ( 2.5 × 10 ± 1.5 × 10 )
100 -- 400 billion ( 2.5 × 10 ± 1.5 × 10 )