I'm assuming you downloaded this large file from NASA's website. 1) Try PNG instead of TIFF and 2) try to match the photo's pixel dimensions to the 1.33 pixel aspect ratio of HDV. So, if you crop the photo to 1920x1080 (or if it's a square pixel count vert. and horz., then resample to 1080x1080 and then expand the Canvas to 1920x1080). Next, resample the horizontal ONLY so it's now 1440x1080 (in Photoshop you do this by IMAGE->RESIZE->IMAGE_SIZE, and uncheck "Constrain Proportions"). It will look wierd (squished along the horizontal) when done, but if you import it into Vegas at 1440x1080, Vegas will automatically assign a 1.33 PAR to the event on the timeline and it will look normal. If you want to zoom into the photo, then multiply all the numbers above by 2x (2x 1440x1080 = 2880x2160), and that will give you room to zoom into the photo in Vegas using keyframes in the Pan/Crop tool. If you do use something larger than 1440x1080, Vegas will set the PAR to 1.0 and the image will look squished in Vegas. To change this, right click on the event on the Vegas timeline, and choose PROPETIES->MEDIA and set the PAR to 1.3333 (HDV 1080). Now the image will be unsquished.

One more thing - targa (.TGA) may be a better choice over PNG, but either will work better than TIFF.

If I might suggest "Hash Animation Master." It works great for me! It has alot of the features of more expensive programs, but comparatively cheap. You can get a copy for $300.00. It does it all. Modeling, compositing, Animating. Plus it has alot of presets so you can pretty much start animating as soon as you install it.I really like it!
I must also agree that Ulead Cool 3d is a good program as well.