(May 10, 2020 at 7:13 am)Rhondazvous Wrote: 1. How can the universe be 93 billion light years in diameter when the big bang was only 13 billion years ago? Can dark energy cause regular matter to move faster than the speed of light?
Because the equation v=d/t ( c = 1 light year / year ) is only valid when space-time is static. In our universe space-time is expanding, so the math gets a bit trickier.
Quote:2. In relation to the orbit of the sun around the center of the galaxy, is the orbit of the Earth around the sun perpendicular or parallel?
Neither. The plane of the ecliptic is inclined at about 60 degrees to the galactic plane.
![[Image: VIipS.jpg]](https://i.stack.imgur.com/VIipS.jpg)
Quote:3. Do all the planets orbit the sun on the same p lane, i.e., around the equator of the sun at the same angle
More or less. Jupiter and the sun force the orbits of the less massive planets into the same plane as Jupiter's orbit give or take a little natural variation.
Quote:4. Why if it we can’t drink sea water, but we can eat sea salt??
Because seawater is much saltier than most mortals would enjoy on their food. Seawater is roughly 3.5% salt. To get a similar amount in your food you'll want about a teaspoon of salt on 1 cup of mashed potatoes.
Quote:5. According to one website, dark energy is made of neutrinos. If we know what it's made of why do we still call it dark?
That website is wrong. Neutrinos suffer problems as dark matter or energy. The biggest is that they aren't entirely "dark". They also don't have enough mass and don't properly account for several properties of dark matter or energy.
