swap_horiz IXPE Alternatives

1

Cassini-Huygens

The Cassini-Huygens mission, operated by NASA and ESA, was a space-based observatory dedicated to studying Saturn and it...

Decommissioned Nasa Planetary Space Based

9.8 Brilliant

2

Gaia

The Gaia observatory is a space-based mission operated by the European Space Agency. It meticulously surveys our galaxy,...

Survey Optical Space Based Astrometry

9.7 Brilliant

3

Kepler Space Telescope

The Kepler Space Telescope was a NASA observatory launched in 2009. It monitored over 150,000 stars for dips in brightne...

Decommissioned Optical Nasa Space Based

9.6 Brilliant

4

Parker Solar Probe

The Parker Solar Probe is a NASA observatory spacecraft investigating the Sun’s outer atmosphere, the corona. Launched i...

Solar Nasa Space Based Heliophysics

9.6 Brilliant

5

Planck

The Planck mission was a European Space Agency-operated observatory designed to study the Cosmic Microwave Background (C...

Decommissioned Microwave Space Based Cmb

9.4 Excellent

6

Hipparcos

Hipparcos was a European Space Agency observatory launched in 1989. It performed groundbreaking measurements of stellar...

Parallax Decommissioned Space Based Astrometry

9.4 Excellent

7

SOHO

SOHO is a space-based observatory operated jointly by NASA and the European Space Agency. It monitors the Sun’s activity...

Solar Nasa Space Based Esa

9.3 Excellent

8

Spitzer Space Telescope

The Spitzer Space Telescope was a NASA space-based observatory operating from 2003 to 2020. It utilized infrared light t...

Survey Decommissioned Nasa Infrared

9.2 Excellent

9

Fermi Gamma-ray Space Telescope

The Fermi Gamma-ray Space Telescope is a NASA observatory orbiting Earth. It detects high-energy gamma rays, providing i...

Survey High Energy Nasa Space Based

9.1 Excellent

10

Herschel Space Observatory

The Herschel Space Observatory is a decommissioned space-based observatory operated by the European Space Agency (ESA)....

Decommissioned Infrared Space Based Esa

9.1 Excellent

11

Neil Gehrels Swift Observatory

The Neil Gehrels Swift Observatory is a NASA spacecraft dedicated to studying high-energy astrophysical events. Launched...

Nasa Space Based Gamma Ray X Ray

9.0 Excellent

12

XMM-Newton

The XMM-Newton observatory, operated by ESA, observes the universe primarily in X-rays. Its large telescope allows for d...

High Energy Space Based X Ray Photometry

8.9 Great

13

BeppoSAX

BeppoSAX was a European Space Agency observatory launched in 1996. This satellite primarily observed X-rays and gamma ra...

Historical Space Based X Ray Gamma Ray Bursts

8.9 Great

14

Uhuru

Uhuru was a NASA-operated space observatory launched in 1970 as the first satellite dedicated specifically to X-ray astr...

Historical Nasa Space Based X Ray

8.6 Great

15

Einstein Observatory

The Einstein Observatory, originally designated HEAO-2, was a pioneering NASA X-ray telescope launched into Earth orbit...

Historical Nasa Space Based X Ray

8.5 Great

16

XRISM

XRISM (X-Ray Imaging and Spectroscopy Mission) is a space observatory jointly developed by JAXA and NASA, launched in Se...

Nasa Space Based Spectroscopy X Ray

8.5 Great

17

Hinode

Hinode, which translates to "sunrise" in Japanese, is a solar observation satellite developed by the Japan Aerospace Exp...

Solar Space Based X Ray Esa

8.4 Great

18

RXTE

The Rossi X-ray Timing Explorer (RXTE) was a NASA satellite launched on December 30, 1995, to study time variability in...

Decommissioned Nasa Space Based Timing

8.4 Great

19

INTEGRAL

INTEGRAL (International Gamma-Ray Astrophysics Laboratory) is a space telescope launched by the European Space Agency on...

High Energy Space Based Gamma Ray X Ray

7.8 Good

20

EXOSAT

EXOSAT was a European Space Agency space observatory launched in 1983 to study X-ray sources beyond Earth. Operating unt...

Decommissioned Historical Space Based X Ray

7.6 Good