... The Magnificent Horsehead Nebula . ... Two Worlds One Sun . ... How different does sunset appear from Mars than from Earth? For comparison, two images of our common star were taken at sunset, one from Earth and one from Mars. ... When Vega is North . ... The bright stars Vega, Deneb, and Altair form a large triangle on the sky that can be seen rising in the early northern early spring during the morning and rising in the northern fall during the evening. Gravitational Anomalies of Mercury . ...