swap_horiz NICER Alternatives

1

Voyager 2

Voyager 2 is a NASA-built spacecraft deployed in 1977. It’s notable for being the first to explore Uranus and Neptune pr...

Active Nasa Interstellar Outer Planets

10.0 Brilliant

2

Voyager 1

Voyager 1 is an active NASA spacecraft launched in 1977. It undertook a flyby mission to Jupiter and Saturn. The probe a...

Active Nasa Interstellar Outer Planets

9.9 Brilliant

3

New Horizons

The New Horizons mission is an active NASA space probe studying the outer solar system. Launched in 2006, it achieved a...

Active Nasa Kuiper Belt Pluto

9.4 Excellent

4

Curiosity Mars Rover

The Curiosity rover is an active NASA mission exploring Mars from Gale Crater. Launched in 2011, it investigates the pla...

Geology Active Nasa Mars

9.3 Excellent

5

Perseverance Mars Rover

The Perseverance rover is an active NASA mission exploring Mars. It operates within Jezero Crater, analyzing the geology...

Active Nasa Mars Rover

9.2 Excellent

6

Lunar Reconnaissance Orbiter

The Lunar Reconnaissance Orbiter (LRO) is a NASA spacecraft currently orbiting the Moon. Launched in 2009, it provides d...

Mapping Active Nasa Moon

9.0 Excellent

7

Swift

The Swift Gamma-Ray Burst Explorer, officially renamed the Neil Gehrels Swift Observatory, is a space telescope launched...

Astronomy Nasa 2004 Multi Wavelength

8.9 Great

8

Landsat 8

Landsat 8 is an active Earth observation satellite operated by NASA and the USGS. This mission continues a decades-long...

Imaging Active Nasa Earth

8.8 Great

9

Mars Reconnaissance Orbiter

The Mars Reconnaissance Orbiter is a NASA spacecraft orbiting Mars since 2006. It provides high-resolution imaging of th...

Imaging Active Nasa Mars

8.8 Great

10

Solar Orbiter

Solar Orbiter is a spacecraft developed by the European Space Agency with NASA participation to study the Sun and the in...

Solar Active Nasa Orbiter

8.6 Great

11

ICESat-2

ICESat-2 (Ice, Cloud, and land Elevation Satellite 2) is an Earth observation satellite launched by NASA in 2018 as a fo...

Laser Active Nasa Ice

8.4 Great

12

Rossi X-ray Timing Explorer

The Rossi X-ray Timing Explorer (RXTE) was an artificial satellite launched by NASA on December 30, 1995, to observe ast...

Astronomy Nasa Past Timing

8.3 Great

13

ACE

The Advanced Composition Explorer (ACE) is a NASA space mission designed to study the composition of matter from the sol...

Active Nasa Solar Wind Heliophysics

8.3 Great

14

Atlantis STS-135

Atlantis STS-135 was the 135th and final mission of NASA's Space Shuttle program, launched in July 2011. Commanded by Ch...

Nasa 2011 Shuttle Iss

8.3 Great

15

Spektr-RG

Spektr-RG is a Russian-German space-based X-ray observatory launched in 2019 and placed in an orbit around the Sun-Earth...

Astronomy Russia Telescope Active

8.2 Great

16

Landsat 9

Launched in September 2021, Landsat 9 is an Earth observation satellite jointly managed by NASA and the U.S. Geological...

Imaging Active Nasa Earth

8.2 Great

17

GRACE-FO

GRACE-FO, the Gravity Recovery and Climate Experiment Follow-On, is a joint NASA and German Research Centre for Geoscien...

Active Nasa Gravity Earth

8.2 Great

18

MAVEN

MAVEN, short for Mars Atmosphere and Volatile Evolution, is a NASA orbiter launched in 2013 and placed into orbit around...

Active Nasa Mars Atmosphere

8.2 Great

19

Suzaku (ASTRO-EII)

Suzaku, originally designated ASTRO-EII, was a Japanese X-ray astronomy satellite launched in 2005 and operated through...

Astronomy 2005 X Ray Jaxa

8.2 Great

20

XPoSat

XPoSat, the X-ray Polarimeter Satellite, is an Indian space observatory launched by ISRO on January 1, 2024, aboard the...

Astronomy Active X Ray Polarimetry

6.7 Fair