Answer:
absolute brightness
Explanation:
The observational fact about a cepheid variable star that leads to a measurement of its distance from earth is that its period of variation is directly related to its absolute brightness
D tornados. tornados have to do with warm and cold fronts of air coming in contact with each other.
Yes it snows, The snow will typically last through March and sometimes on into the beginning of April
Answer:
disease has impacted populations in the United
States and in Developing countries
Explanation:
People have to close down their stores, shops, and resturant's, and also some hospital's, they even have to close down the airports. Then a lot of people, kids, children, and babies, are dying from Coronavirus espcially adults.
The best answer for this question would be:
2. Cosmic Background Radiation
The Cosmic Background Radiation are when the heat of a planet is measured by the left over heat of it. This is based on the “Big bang Theory” wherein the planets were formed because it was once a very hot radiation.
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