The atmosphere of Neptune is similar to that of Uranus. It is about 80% hydrogen, 19% helium, and 1.5% methane. However the weather activity on Neptune is much more active, and its atmosphere is much bluer than that of Uranus.
If your goal is a legitimate tax deduction, then you must be giving to a qualified organization. Also, you cannot deduct contributions made to specific individuals, political organizations and candidates. See IRS Publication 526, Charitable Contributions, for rules on what constitutes a qualified organization.
You can deduct contributions of either money or property to religious or service organizations, like churches, United Ways, Goodwill Industries and the Red Cross. These generally need IRS 501(c)3 tax-exempt status. You also can deduct donations to governments to support things like parks and recreational facilities.