Table of Contents
What is the density of stars in the galaxy?
10 million stars per cubic parsec
Within a parsec of the galactic center, the estimated number density of stars is about 10 million stars per cubic parsec.
What is the density of the universe?
The expansion rate we see today indicates that the critical density of the Universe is about 9×10-27 kg m-3. This density, however, is the total density of both matter and energy.
What is the star density of the Milky Way?
Density distribution of various types of stars
| Space densities of stars | |
|---|---|
| object | density (solar mass per cubic light-year) |
| gG, gK stars | 0.00003 |
| gM stars | 0.0000003 |
| dark companions | 0.00014 |
How heavy is the Milky Way galaxy?
around 1.5 trillion solar masses
Their answer: The galaxy weighs around 1.5 trillion solar masses. This number helps put in perspective how very small we are. Take, for instance, where stars in the Milky Way fit in.
Is the Hubble telescope?
The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation….Hubble Space Telescope.
| Names | HST Hubble |
| Mission type | Astronomy |
| Operator | NASA · STScI · ESA |
| COSPAR ID | 1990-037B |
| Spacecraft properties |
|---|
How old is the oldest planet?
about 12.7 billion years old
The planet is one of the oldest known extrasolar planets, believed to be about 12.7 billion years old….PSR B1620−26 b.
| Discovery | |
|---|---|
| Eccentricity | low |
| Orbital period | 36,525 d ~100 y |
| Inclination | 55 |
| Star | PSR B1620-26 AB |