The Milky Way Galaxy
It is estimated to contain 100–400 billion stars and at least that number of planets. Our Solar System is located at a radius of about 27,000 light-years (8.3 kpc) from the Galactic Center on the inner edge of the Orion Arm, one of the spiral-shaped concentrations of gas and dust. Our galaxy is considered to be on the small side compared to others a good example is our nearest neighbour Andromeda which is 152,000 light years across or 46 Parsecs almost double the Size of the milky way at 26.8 Parsecs or around 87,000 Light Years. Andromeda is said to be home to over 1 trillion stars.
Two Trillion Galaxies
James Webb Space Telescope: By peering deeper into the universe, data from the James Webb Space Telescope (NASA) reveals even distant and faint galaxies. Modern extrapolations based on these deep surveys place the total number of galaxies in the observable universe at around 2 trillion.
So, say the average Galaxy has around 700B – 1TR Stars and roughly the same in planets (however its likely to be 10x that)
850,000,000,000 x 2,000,000,000,000 =
1.7e+24 is scientific notation.
The concise answer: 1.7 × 10²⁴ = 1,700,000,000,000,000,000,000,000.
1.7 septillion stars