By the human eye, sometimes. Many produce radiation that can be detected, but this occassionally requires equipment such as radio telescopes.
All stars 'burn' hydrogen
Shooting stars are not actually stars but rather meteors that enter Earth's atmosphere and burn up, so they are not part of constellations. Constellations are patterns of stars as seen from Earth, and shooting stars move too quickly to be part of a fixed pattern.
Stars typically turn red before they burn out.
The color of the stars depend on how hot they burn.
Stars are typically seen at night when the sky is clear and dark, away from light pollution. You can also see some stars during the day if the conditions are right, but they are most visible at night.
Yes, young stars burn Hydrogen and produce Helium. As they age, they often turn into red giants, and at that time they burn the Helium, making Oxygen and Carbon. Very large stars can even burn the Oxygen and Carbon, making even heaver elements, such as Iron.
yes because it can burn out
* Facepalm *
Massive
Because.. the light from the Sun is far too bright to allow stars to be seen.
All main sequence stars fuse hydrogen.
Constellations are imaginary patterns in the sky formed by stars. As some stars burn out, new stars form.