What is the density of dark matter in our galaxy?
The dark matter density near the solar system, from what I could find, sits at around 0.006 solar masses per cubic parsec, which is a set of units that’s not going to make much sense unless you’re a professional astrophysicist. This is extremely low density.
What is the volume of the universe?
Since the universe has been expanding for 13.8 billion years, the comoving distance (radius) is now about 46.6 billion light-years. Thus, volume (43πr3) equals 3.58×1080 m3 and the mass of ordinary matter equals density (4.08×10−28 kg/m3) times volume (3.58×1080 m3) or 1.46×1053 kg.
How big is the visible universe?
46.508 billion light years
What is the edge of the universe?
The Universe has many edges: the edge of transparency, the edge of stars and galaxies, the edge of neutral atoms, and the edge of our cosmic horizon from the Big Bang itself. We can look as far away as our telescopes can take us, but there will always be a fundamental limit.
What happens if you are stuck in space?
The vacuum of space will pull the air from your body. So if there’s air left in your lungs, they will rupture. Oxygen in the rest of your body will also expand. You’ll balloon up to twice your normal size, but you won’t explode.
Can you see planets in the daytime?
Crescent Venus (left) and crescent moon, through a telescope, in daytime. Venus is the most commonly seen sky object seen in daytime, after the sun and moon. You can see the brightest planet, Venus, in daylight, too, if you know exactly where to look.
Can you see the moon in the daytime?
We can see the moon during the day for the same reason we see the moon at night. The surface of the moon is reflecting the sun’s light into our eyes. “When we see the moon during the day it’s because the moon is in the right spot in the sky and it’s reflecting enough light to be as bright, or brighter, than the sky.”
Why can you sometimes see the moon in the daytime?
As the moon continues in its orbit around the Earth, away from the sun, increasingly more of its sunlit surface is visible. This is why the moon sometimes appears as a crescent or half-moon. When it’s farther from the sun and visible above the horizon, it’s easier to spot during the day.