Astronomy Picture of the Day . Mars Moons . ... But while Mars was so bright it was hard to miss, spotting Mars' two diminutive moons was still a good test for observers with modest sized instruments. ... The Heart and Soul Nebulas . ... Possibly not, but that is where two bright emission nebulas nicknamed Heart and Soul can be found. ... Tracking major weather patterns on the Solar System's outermost gas giant can help in the understanding of global weather patterns here on Earth. ...