Thus, dark matter constitutes 85% of total mass, while dark energy plus dark matter constitute 95% of total mass–energy content.

In the Milky Way there is about 30 times more dark matter than normal matter. Dark Matter in the Universe . b. I do not understand exactly how this result had been got. Roughly what percentage of the total mass of a galaxy is made up of luminous, or normal, matter? 5–10 percent. More sophisticated calculations based on more sophisticated models give a similar result. 9.2. Galaxies range in size from dwarfs with just a few hundred million (10 8) stars to giants with one hundred trillion (10 14) stars, each orbiting its galaxy's center of mass. a. So, in 1 mole of water there are 2 x 1.008 grams of hydrogen.

Using up much of the mass and energy (even the infrared). What percentage of the galaxy do you think Kevin makes up, mass wise? It is now believed that about 95% of the galaxy is composed of dark matter, a type of matter that does not seem to interact with the rest of the galaxy's matter and energy in any way except through gravity.

Did the Planck mission scan the entire universe as it is today to get these figures or just a part of the universe? This mass-energy appears to consist of 68.3% dark energy, 26.8% dark matter and just 4.9% ordinary (luminous) matter. Our complicated universe.

Dark energy is thought to make up 73 percent of the total mass and energy in the universe. Galaxy - Galaxy - Luminosity: The external galaxies show an extremely large range in their total luminosities. However, the mass of the Sun is completely trivial compared to the mass of the Galaxy. The orbital velocities of stars and gas in the Milky Way reveal the presence of this invisible matter.. Mass Measurement (Galaxies and Galaxy Clusters) Anyway, these are their results and they clearly show that a galaxy like the Milky Way that has about 200 billion stars and a stellar mass of about $5\times10^{10}M_{\odot}$ (note that the total mass of the Milky Way is dominated by dark matter), is quite a massive galaxy (note the logarithmic y-axis).

The intrinsically faintest are the extreme dwarf elliptical galaxies, such as the Ursa Minor dwarf, which has a luminosity of approximately 100,000 Suns. It may give off other radiation (such as infrared). It seems that supermassive black holes lie at the centre of most galaxies, including our own. This ‘dark matter’ makes up 90% of the mass in typical galaxies. The dotted curve is predicted if the mass in the galaxy ends at the visible edge of the galaxy, about \(14\,{\text{kpc}}\) (or 46,000 light years ) from the center. The total mass of the compound is the sum of the mass … The rest - everything on Earth, everything ever observed with all of our instruments, all normal matter - adds up to less than 5% of the universe. It doesn't necessarily shine like we think of a star shining. Kevin, whilst absolutely super-massive, is a tiny, tiny 1/10,000 of a percent of the Milky Way galaxy’s mass. The actual data do not follow the prediction, indicating that unseen mass exists beyond the visible edge.

The most luminous galaxies are those that contain quasars at their centres. Galaxy rotation curve. This suggests there is unseen, but substantial, mass holding stars in orbit.

A new class of galaxy has been discovered, one made almost entirely of dark matter Dragonfly 44 is very faint for its mass and consists almost entirely of dark matter…

The latest observations focused on an ultra-diffuse galaxy -- ghostly galaxies that are large but have hardly any stars -- called NGC 1052-DF2. About 80% of the Universe's gravitating matter is nonluminous, and its nature and distribution are for the most part unknown. New class of galaxy has been discovered, made almost entirely of dark matter (washingtonpost.com) 288 points by daegloe on Aug 26, 2016 ... they'd also be made of normal matter, and if they're not, then we're back to some exotic form of matter like dark matter.

Next, you use the mass percentage formula. Fig. Our own Galaxy, the Milky Way , is spiral and c. 100,000 light years in diameter. Come to think of it, maybe it shouldn't be called "normal" matter at all, since it is such a small fraction of the universe. Normal matter is luminous, that is, it interacts electromagnetically and gravitationally with other matter and with radiation. The luminous matter makes up approximately 9 × 10 10 solar masses.