<span>An economic indicator shows the measurement to determine and
analyze the economic progress and performance of a country. Examples of this are consumer price index,
inflation, industrial production, bankruptcies, gross domestic product, retail
sales, stock market prices, money supply changes and unemployment rate. How these indicators perform depends on the
effectiveness of the policies and programs being implemented by the government’s
economic institutions. If these policies
help in the improvement of the country’s economic development then it will be
reflected in these indicators. Same can
be said if it is not effective.</span>
Answer:
The real observations are:
Moon rises in east, sets in west each day.
stars circle daily around north or south celestial pole
Positions of nearby stars shift slightly back and forth each year.
A distance galaxy rises in east, sets in west each day.
We sometimes see a crescent Jupiter.
Explanation:
Mercury it can seen from the Earth but no it phases.
Moon is seen in all parts of the Earth, the only difference is that in north pole the stars moves parallel to the horizon.
By the rotation of Earth the relative position of stars changes a little bit.
In the north pole a galaxy can be observed and in the south pole 2 galaxies.
Jupiter is one of the planets that can be seen from Earth in some seasons and it changes the position due to the rotation of planets around the sun.
A planet beyond Saturn is not possible to be observed from Earth just with the naked eye.
Answer:
b. flat rotation curves in spiral galaxies
Explanation:
Dark matter accounts for majority of the matter in the universe (about 85%). It is considered to be composed of subatomic particles which are yet to be discovered. Dark matter cannot be observed because it does not emit light that can be detected. Only its gravitational effect is visible.
Astronomers when calculated the mass of the visible matter and tried to account for the observed speed of stars in the galaxy, there was a mismatch. To understand what caused this mismatch, astronomers gave name to the invisible matter as the Dark Matter.
The expected velocity of stars should decrease away from the near the center of the galaxy but a constant velocity of stars was observed that is a relatively flat rotation curve was obtained.
Thus, flat rotation curves in spiral galaxies in an evidence of Dark Matter.
Answer:
i think it is helium is burned oxygen and helium is light
