Its called a telescope!
they can use infra red glasses to look at the sun directly Question: but how do they know that there is a core in the sun. the infra red glasses cant just look straight through the sun??!
Scientists did not find the sun. The sun has been visible to mankind since the dawn of time.
about 10(glases, glasses, glassses, glasssses,) oh well you get the story
A near-perfect alignment will result either in a solar eclipse, or in a lunar eclipse.
Scientists can not gather information IN the Sun.
I don't think there is anything we can do if the Sun were to die.
Most scientists think the sun will expand into a red dwarf in about 4.5 billion years. There are other theories as well.
You never know how long is sun going to live because the sun is extremely hot so the scientists cant look inside the core to find out how long did it live, when it was created, and how much longer is going to live.
scientists think that the sun makes energy by having oxygen go past it so many times.
Scientists approximate the sun will die in about 10,000,000 years.
Using mathematical models of the sun.
Scientists look for observable patterns and they measure whatever is objectively quantifiable.