1. **James Webb Space Telescope (JWST)**: This is the most powerful space telescope ever built, set to launch in 2021. It will observe the universe in the infrared spectrum and is expected to revolutionize our understanding of exoplanets, the formation of stars and galaxies, and the early universe.

2. **Advanced LIGO**: While not a telescope in the traditional sense, Advanced LIGO has opened a new window to the universe by detecting gravitational waves, allowing us to "see" events like black hole mergers that were previously undetectable.

3. **Gaia Space Telescope**: This mission from the European Space Agency is creating a 3D map of the Milky Way. It's providing unprecedented data on the position, motion, and brightness of billions of stars.

4. **Kepler Space Telescope**: Despite its issues, the Kepler telescope has been instrumental in discovering over 2,600 exoplanets and has significantly advanced our understanding of the prevalence of planets beyond our solar system.

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5. **Chandra X-ray Observatory**: This X-ray telescope has been in operation since 1999 and has provided astronomers with a new tool for exploring the universe. It's helped to study everything from supernova remnants to quasars.

6. **Hubble Space Telescope**: Even after decades in operation, the Hubble is still providing valuable data. Its images have not only contributed to scientific research but have also captured the public imagination.

7. **Euclid Space Telescope**: An upcoming mission by the European Space Agency to investigate the nature of dark matter and dark energy.

8. **Laser Interferometer Space Antenna (LISA)**: This is a future space observatory that will detect gravitational waves from space. It's expected to launch in the 2030s.

9. **Wide Field Infrared Survey Telescope (WFIRST)**: This is a NASA mission that will survey the cosmos in near-infrared light. It's designed to answer fundamental questions about dark energy, the nature of dark matter, and the evolution of the universe.

10. **ALMA (Atacama Large Millimeter/submillimeter Array)**: While not a space telescope, ALMA is a ground-based observatory that has made significant contributions to our understanding of the universe through its ability to observe in the millimeter and submillimeter wave bands.

Each of these developments represents a significant step forward in our ability to observe and understand the universe. They also represent a wide range of technologies and scientific objectives, from the study of gravitational waves to the search for exoplanets.