Figure 1: Hubble Space Telescope Orbits
Gravitational Lensing?
For an observer in North latitudes, the best place in the sky is the constellation Ursa Major, the familiar Big Dipper. In addition to being very easy to spot, it has the advantage of being a circumpolar constellation. That is, at latitudes greater than 30 degrees North, it is visible in the night sky at any time of year.It contains three bright stars: Alioth and Alkaid in the handle, and Dubhe.Dubhe is the so-called ‘pointer star’, leading the eye in the direction of Polaris, the North star.
