The tilt, or the inclination of Earth's axis, is ___ from perpendicular to Earth's orbit. (That is, the answer would be zero if Earth's axis ran straight up from the ecliptic.)

concave lenses are used here. they spread the light out before it reaches the convex lens in the eye, therefore letting the image focus directly on the retina. hyperopia is known to you probably as farsightedness.

i would think form in reponse to tensional forces

earth's neighboring galaxy, the andromeda galaxy, is a distance of 2.54×107 light-years from earth. if the lifetime of a human is taken to be 70.0 years, a spaceship would need to achieve some minimum speed min to deliver a living human being to this galaxy.