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In every LASCO image you can observe objects whose trajectories are almost exactly horizontal. The majority of these objects are stars. (The rest being very occasional planets and asteroids.) Every C3 image has approximately 200-300 visible stars and every C2 image has approximately 10-30 stars visible. Stars will always move from left-to-right (due to SOHO's orbit about the Sun) at a speed of a few pixels/hour. Occasionally, planets appear in LASCO images and they, too, have a nearly horizontal motion. However, planets can move left or right through the field-of-view and can be faster or slower than the background stars.