Science physics homework help please! xxxxxxxx?

Question

hey it would be greatly appreciated if someone could help me with this...

what does the word fusion mean in 'nuclear fusion'?

what is a light year?

" "galaxy?

" "telescope?

red giant

white dwarf

black dwarf

protstar

main sequence star

variable star

white dwarf with 'planetary nebula'

cloud of gas and dust

what property of light causes a star to twinkle?

or if anyone could suggest a good website that has this website that information would be great

thank you

xxxxxxxx

Answer 1

light year- the distance light travels in a year

galaxy- a collection of stars.

telescope- something to magnify your view of far distances

red giant- a phase in a stars life when the..hydrogen? molecules are all used.

white dwarf- small white star..could  be the result of a star that has died

black dwarf- ?

" "

" "

white dwarf with planetary nebula- after a large star has died and gone through its phases, the result is either a black hole or  a white dwarf, maybe right after the white dwarf is made, its has a nebula type thing around it

cloud dust- explains itself

a star twinkles b/c their "image" i guess is knocked around a bit b/c of the turbulence in the atmosphere b/c of hot and cold air pockets

Answer 2

this site has everything you need

http://hyperphysics.phy-astr.gsu.edu/hba...

Answer 3

You have asked quite a few questions and I'll try to answer all :

Nuclear Fusion : Here "fusion" means combination - combination of two or more light nuclei to form a single comparatively heavier nucleus.

Light Year : A light-year or light year (symbol: ly) is a unit of length. A light-year is the distance that light travels in a vacuum in one Julian year.

Galaxy : Galaxy is a massive, gravitationally bound system consisting of stars, an interstellar medium of gas and dust, and dark matter.

Telescope : A telescope is an instrument designed for the observation of remote objects and the collection of electromagnetic radiation.

Red Giant : A red giant is a luminous giant star of low or intermediate mass (roughly 0.5–10 solar masses) that is in a late phase of stellar evolution.

White Dwarf : A white dwarf, also called a degenerate dwarf, is a small star composed mostly of electron-degenerate matter. As white dwarfs have mass comparable to the Sun's and their volume is comparable to the Earth's, they are very dense.

Black Dwarf : A black dwarf is a hypothetical star, created when a white dwarf becomes sufficiently cool to no longer emit significant heat or light.

I think you can find the rest if you go to Wikipedia or open your Physics Textbook!

Answer 4

http://en.wikipedia.org/wiki/Main_Page

I don't know if it has al you need, but it has a lot of information.

Good luck with it.

Answer 5

I could suggest looking at your science text book.

Try encarta, try google, try an online encyclopedia.