Different missions answer different questions
A flyby can survey a target quickly, an orbiter can watch changes over time, and a lander can examine a small area in detail. Rovers trade extra mobility for greater engineering complexity. Mission design begins with the scientific question and then works through power, mass, communication, and launch constraints.
Orbit is continuous falling
An orbiting spacecraft is constantly pulled by gravity while moving sideways fast enough to keep missing the body below it. Changing velocity changes the orbit. Reaching a destination therefore involves careful timing and navigation rather than simply pointing a rocket at a visible planet and flying in a straight line.
Instruments extend our senses
Cameras provide only part of a mission’s scientific return. Spectrometers examine how light varies with wavelength, magnetometers measure magnetic fields, and particle detectors investigate charged particles. Each instrument has limits and uncertainty. Combining measurements gives scientists stronger explanations than relying on a single attractive image.
Follow primary mission updates
Launch dates and spacecraft status can change. Use official agency mission pages for current milestones and distinguish planned operations from completed results. A press release may describe an initial interpretation; later measurements and peer review can refine it. This site focuses on enduring concepts rather than presenting an unmaintained launch calendar.
Continue with primary sources
Use official resources for current mission information, image captions, and deeper science.
NASA Science ↗ESA ↗
EXPLORE / STARGAZING
EXPLORE / SOLAR SYSTEM
EXPLORE / THE MOON